Yellow Fever and Its Prevention. A Manual for Medical'Students and Prac titioners. By Sir Rubert W. Boyce, M.B., F.R.S. New York: E. P. Dutton&Co., 1911. 8vo.; 380 pp.; illustrated. Price, $3.50 net. The distinguished author of “Yellow Fever and Its Prevention” has had exceptional opportunities for the observation of this scourge in New Orleans, Central America, the West Indies, and Africa. His high standing in pathology and tropical medicine gives the volume an authority which no student or practitioner can afford to ignore. Many will recall his previous work, “Health Progress and Administration in the West Indies,” in which was sketched the history of' yellow fever in the West Indies and Central America. The present work deals more particularly with the scourge as observed in West Africa, although its general history and geographical distribution are first given. In succeeding divisions the disease is discussed from the viewpoints of symptomatology and treatment, pathology, epidemiology, and entomology, while not the least interesting and perhaps the most practical division is the closing one, under the head of prophylaxis. In this division a successful plan of campaign is drawn, which includes prompt official notification of the danger, the enforced retirement of non-im-munes to a place of safety, an organized attack upon the breeding grounds of the Steg-om1j»o, the evacuation and fumigation of infected bungalows, and the perforation of gutters. Plates, maps, and fever charts elucidate the text and add materially to its value. Gas Engines. By W. J. Marshall and Capt. H. Riall Sankey, R.E. New York: D. Van Nostrand Company, 1911. 8vo.; 278 pp.; illustrated. Price, $2 net, "Gas Engines” is addressed primarily, not to designers and manufacturers, but to purchasers and users, that they may gain a better understanding of the possibilities and peculiarities of the internal-combustion engine and acquire more satisfaction and profit in its use. The intending purchaser is given information that will guard him against impossible claims for power and economy. The theory of the subject is carefully set forth, with the fundamental principles of its thermo-dynamics. The descriptions of typical cycles are accompanied by that wealth of illustration which is absolutely necessary to thorough instruction in any complicated device. The operation of the engine is given the space and consideration worthy of its importance. Gas and gas producers form the subject of the final chapter. The work is a very condensed and satisfactory presentation of a subject of universal interest. Mathematics for the Practical Man. By George Howe, M.E. New York: D. Van Nostrand Company, 1911. 12mo.; 143 pp. Price, $1.25 net. The author has been impressed by the scarcity of published courses in the fundamentals of mathematics, and the tendency of these courses to treat the subject in a popular rather than a scientific way. The attendance at night schools is made up of such diverse bodies of men, of such varying degrees of training or lack of training, that instruction must always begin with studies already familiar to a large number of the students. The textbook in hand is designed to meet the requirements of night classes, in that it begins at the beginnVng, assumes no mathematical knowledge beyond arithmetic on the part of the student, and strives to eliminate the vagueness and diffuse-ness of the average elementary work. It contains the fundamentals of algebra, the first principles of trigonometry, logarithms, and the elementary principles of co-ordinate geometry and of the calculus. Les Lois Experimentales de l'Aviation. Par M. Alexandre. See, Ancien Elevede l'Ecole Polytechnique. Paris: Librairie Aeronautique, 1911. 8vo.; 348 pp.; il-lustrated. M, See's papers constitute a thoughtful and well-arranged presentation of the laws governing the science of flight. The five divisions of the work are “The Laws of Air-Resistance,” “The Theory of the Aeroplane,” “The Flight of Birds” “A Study of the Propeller,” and “The Problem of Stability.” The conclusions at which the author arrives, and the expression of these conclusions in principles and equations, occupy far too much space to be summarized here, But the work will well repay study, and should be in the library of all experimenters. It is characterized by its Parisian reviewers .as a remarkably clear and complete exposition of flight and the laws by which flight is governed. Rand-McNally Official Indexed Pocket Maps and Shippers' Guides. New York: Rand, McNally&Co., 1911. Price, 25 cents each. We are in receipt of the following pocket maps and guides : Alberta. Colorado, Florida, Illinois. Indiana. Manitoba, Massachusetts, Mexico. Michigan. Minnesota, Newfoundland, New Jersey. New York, Ohio, Oregon, Saskatchewan. Texas. and Washington. These are detailed and very legible maps. showing the steam railroads and proposed extensions. with all stations and junctions plainly indicated. Electric roads are given in red. The new divisions and boundary lines, and the new post offices and express offices, are entered. Population, based upon the figures of the latest Census, is given for every city and village, Shippers, travelers, Civil Service students and others will continue to appreciate the cheap and handy form of this up-to-date information as they have done In the past. Electroplating. By Henry C. Reetz. Chicago: Popular Mechanics Company, 1911. 12mo.; 99 pp.; illustrated. Price, 25 cents. This treatise describes the process of electroplating and tells how to make a small outfit with a glass fruit jar and a wet battery. The more advanced phases of the subject are also entered, with a description of shop equipment and specific directions for nickelplating, silverplatt'1g, and goldplating, and a chapter of suggestions that may aid in establishing the beginner upon a business basis. The Whistler Book. A Monograph of the Life and Position in Art of James McNeill Whistler. Together with a Careful Study of his more Important Works. By Sadakichi Hartmann. Boston: L. C. Page&Co., Inc., 1910. 12mo.; 272 pp. ' The art of Whistler Is very much in the public eye in this country at the present time owing to the remarkable Whistler exhibition which was held last year in the Metropolitan Museum. The writer is admirably equipped to perform a most difficult task. The illustrations are admirably chosen and are beautifully executed, being printed on coated paper; the illustrations are inserted. Like all the books in this series, it is beautifully printed and bound. Wood-working for Amateur Craftsmen. By Ira S. Griffith, A.B. Chicago: Popular Mechanics Company, 1911. 12mo.; 121 pp.; illustrated. Price, 25 cents. The student is first taught the care of tools, the laying out of rough stock, and the uses of the plane and the saw. Several simple objects are then pictured, such as a bird an umbrella stand, a table, a cabinet—and in taking the beginner through the details of their construction further knowledge of the handling of tools and material is easily and naturally imparted. The Boston Museum of Fine Arts. By Julia DeWolf Addison. Boston: L. C. Page&Co., Inc., 1910. 12mo.; 454 pp. The present work gives a descriptive and critical account of the treasures of the Boston Museum of Fine Arts, which represent the arts and crafts of remote antiquity to the present time. A work of this kind is of the greatest possible value, as it can be taken right into the gallery, where it serves as an amplified catalogue. The collections in the Boston Museum of Fine Arts are too well known to call for any praise. The collection has been admirably made and is admirably housed, particularly in the new buildings. The illustrations in the book are wisely selected and are beautifully reproduced and printed. Like all the books of this publisher, it is an excellent piece of book making and is attractively bound. Molding Concrete Chimneys, Slate and Roof Tiles. By A. A. Houghton. New York: The Norman W. Henley Publishing Company, 1911. 61 pp. Price, 50 cents. This handbook is No. 4 of the series, and is explanatory of the ways in which roof tiling and chimneys are manufactured of concrete. The text is fully illustrated by original drawings, and in this, as in the other numbers of the series, a feature is made of easily constructed molds. The factor of safety has been steadily kept in mind. Molding and Curing Ornamental Concrete. By A. A. Houghton. New York: The Norman W. Henley Publishing Company, 1911. 58 pp. Price, 50 cents. This, No. 5 of the “Concrete Worker's” series, tells the proper proportions of cement and aggregates for different finishes, with the methods of mixing and placing in the molds, and of curing and remedying defects in the surface finish. Also the manner of coating the molds with non-adhesive compound to prevent the concrete from sticking to the molds, Train Rule Examinations Made Easy. By G. E. Collingwood. New York: The Norman W. Henley Publishing Company, 1911. 18mo.; 234 pp. Price, $1.25. Practical Instructor and Reference Book for Locomotive Firemen and Engineers. By Charles F. Lockhart. New York: The- Norman W. Henley Publishing Company, 1911. 12mo.; 362 pp. Price, $1.50. Up-to-Date Air-Brake Catechism. By Robert H. Blackall. New York: The Norman W. Henley Publishing Company, 1911. 12mo.; 352 pp. Price, $2. These three books are of the practical kind that will appeal to men who are actually engaged in railroading. Mr. Blackall's “Air-Brake Catechism,” which has long been a standard work, describes the air-brake equipment and how It is operated. Mr. Lockhart's book is a text book for locomotive engineers and firemen. Mr. Collingwood's book is in the nature of a quiz, and follows tile question and answer method. The three books may be recom -mended for giving a vast amount of information in a very compact form. Immune Sera. By Dr. Charles Frederick Bolduan. New York: John Wiley&Sons, 1911. 226 pp. Price, $1.50. It is probably safe to say that in the scientific world there are few subjects of greater importance, as far as the great public is concerned, than that of the bacteriological treatment of diseases. The advances made in thi field, particularly during the past few years, have been greater, or at least as great as, those in any other field of research. Naturally a subject which touches the well-being o the race so closely as this has provoked a widespread interest, not merely in the medical profession, but throughout every walk of life -Because of the highly scientific character o f the investigations and achievements of the bacteriologist, his work is not easily explained-and is difficult of understanding, not merely by the average citizen, but even by many practitioners whose greatly occupied time prevents them from keeping in close touch with the progress which has been made. Consequently-there has been a call foJ; a work on the subject which would be accurate, simple and concise, yet sufficiently comprehensive for a clear understanding of what has been done and o the ' reasonable expectations of future progress . In the work under review, Dr. Bolduan ap -pears to have successfully met this need. The present volume is the fourth edition of a which first appeared in 1904, and which deal t only with certain anti-bodies, whose discovery had aroused a great deal of scientific interest-To this was added in subsequent editions a discussion of anti-toxins, agglutinins, and op sonins, all of which were naturally embraced under the title “Immune Sera.” In the pres ent edition the scope of the subject matter has been widely extended, and the work contains a clear exposition of the main facts of inf'ec-tion and immunity. Every one who has sufficiently interested to read even cursorily the broader literature on this subject is familia r with the side-chain theory of Ehrlich, which u-' late years has dominated the investigations in this particular field. While admitting the value of Ehrlich's work, the author considers that some of the deductions from his theory have led to conclusions which seemed to violate established biological facts. Therefore, in giv -ing a lengthy presentation of Ehrlich's views, he makes it clear just why and wherein other investigators have differed from him. 0 f particular interest at the present time is a chapter dealing with the principles underlying the treatment of syphilis with Salvarsan, o r 606, as it is popularly called. The value o f this drug is now generally conceded, and leads one to hope that further work along simila lines will sooner or later bring to light specifi c therapeutic agents in other diseases. Those of our readers who have followed the newer conceptions of physical chemistry wil-be interested to see how quickly and extensively these have been taken up by the workers in this fascinating department of medicine. Dr. Bolduan has succeeded in fulfilling the aim of this work, which is to present a broad, clear outline of the main facts and theorie concerning infection and immunity. An excellent feature of the book is the fact that i t i& presented in clear, concise, and forceful English that is not overburdened with technical phraseology. Theorie Physico-Chimique de la Vie et Generations Spontanees. By Ste-phane Leduc. Paris: A. Poinat, '1910. 8vo.; paper. In the introduction to his remarkable book, Prof. Leduc states that the essential phenomenon of life is nutrition. If food is to be assimilated, it must be introduced in the liquid state; hence the elementary phenomenon of life is the contact between alimentary liquids and living substances, and the knowledge of life is subordinated to the knowledge of the physico-chemico phenomena which result from the contact of different liquids. Biology. in Prof. Leduc's opinion, is therefore a part of the physical chemistry of liquids, The physical chemistry of life, therefore, comprises a study of all non-electrolytic solutions and electrolytic solutions, of colloidal solutions. of we molecular forces at play in these solutions. osmotic pressure, crystallization, and the phenomena produced by such forces as diffusion and osmosis. The Tennessee Shad. By Owen Johnson. New York: The Baker&Taylor Com. pany. 12mo.; 310 pp.; illustrated. Price, $1.20 net. When Owen Johnson's “The Varmint” first immortalized the American preparatory school as a few classics had immortalized the so-called “public schools” of England. not the least inspired episode was that of the Tennessee Shad's “sleep prolonger"- and its exploitation by Doc Macnooder. Doc. it will be remembered, so skillfully engineered the financial end of the business as to divert to himself all the profits of the enterprise, In this later story the Tennessee Shad's imagination continues to effervesce, and the development of Macnooder's business instincts is calculated to make a pall-bearer chuckle. Johnson's handling of school themes is delicious and inimitable. October 21, 1911 SCIENTIFIC AMERICAN 377 LEGAL NOTICES OVER 65 YEARS' EXPERIENCE Trade Marks Designs Copyrights Ac. INVENTORS are Invited to communicate with Munn&Co., 301 Broadway, New 'York, or f;25 F Street, Washington, D. C., in regard to securing valid-patent protection for their inventions* Trade-Marks and Copyrights registered. Desi g n Patents and Foreign Paten rs secured. A Free Opinion as to th e probable patentability of an invention will be readily given to any inventor furnishing us with a model or sketch and a brief description of the device in question. All communications are strictly confident!aL Our Hand-Book on Patents will be sent free on request. Ours is the Oldest agency for securing patents; it was established over sixty-five years ago. MUNN&CO., 361 Broadway, New York Branch Office. 625 F St.. Washington. D. C. PA T F N T ^ SECURED OR FEE ATE N 1 S RETORMEX) Free report as to Patentability. Illustrated Guide Book. and What To Invent with Lbt of Inventions Wanted and Prizes offered for inventions sent free. VICTOR . T. KV ANS&CO.. Wash in gton. D.C. Classified Advertisements Advertising in this column is 7;'fJ cents a line. No less than four nor more than 12 lines accepted. Count Beven words to the line. All orders must be accompanied by a remittance. AERONAUTICS. BAMBOO. Special erades of Bamboo for Aeronautic Work.Reed, Rattan and Split Bamboo for models. All a e a d c diam.,anylenKtb. 1. Deltour, Inc., 49 6th Ave., N. ft. C. BOOKS. GET WISE-*1.00 BUYS SEVERANCE'S GREAT Woi'k on Rapid Methods in Mental and Written Arithmetic. 192 pages; size Sent postpaid on receipt of price. D. N. Severance, Detroit, Mich. DEAFNESS. THE DEAF HEAR INSTANTLY with the Acousti-con. For personal use. also tor churches and theatres. Special instruments. You must hear before you purchase. Booklet free. General Acoustic Co.,207 Beaufort St., Jamaica, N.Y. City. Paris branch, 6 Rue d 'Hanovre. PATENTS FOR SALE. VALUABLE PATENT FOR SALE-Machine without competition. Good trade established. Big market. No experiments. An absoi utely clean proposition. Best reasons for selling, R. Winkler, Covington, Ky. CONCRETE BUILDING BLOCK PATENT. Designed for efficiency, strength. and simplicity. Substantial improvement, suitable for basis of permanent business. B.J. Forbes, 76 Campbell Ave., Revere, Mass. FOR SALE. Patent No. 1.002492 Land i ble, pivotal ly mounted. to sti addleany :r i. in cultivation; may operate close to or ^Tii'.^ ti..... sides of plants ; by slight rearrangements ;j --l .....i>'.-:; fields. Jay Brooks, Lafayette, Oreson. FOR SALE. FOR SALE-10,OOO tons Pea Coke; 10.000 tons Slaked Lime. Very cheap. Big - bargain to whoever can handle either of these materials. For full particulars and terms of sale. write Goetz Bros., New Albany, tnd. FOR SALE—A Patent Curtain Hanger or Holder where no pins, hooks or rings are needed. Full particulars and terms on request. I. Krajkowski, 4558 East Thompson street, Brideshurg, Philadelphia, Pa. HELP WANTED. WANTED—Laboratorian, M.OO per diem. A competitive examination will be held for this position October 30, 1911. For further information address Commandant, Navy Yard, Brooklyn, N. Y. LOCAL REPRESENTATIVE WANTED.-Splendid income assured right man to act as our reprpsentative afrer learning our business thoroughly by mail. former experienoe unnecessary. AH we require is honesty, ability, ambition and willingness to learn a lucrative business. No soliciting or traveling. This is an exceptional opportunity for a man in your section to get into a big paying business without capital and become independ'-ent for lite. Write at once for full particulars. Ad-et Real Estate Company,L 378 Mardeu Building.Wasbing-ton, D. C. WANTED. MUNN&CO.—Desires to secure the services of a competent patent attorney, skilled in the preparation of patent specifications. Address Munn&Co., Patent Attorneys, 361Broadway, New York City. WANTED—Manufacturer to make an article. mostly brass, some steel and wood, nickle plated. Steady proposition. On market several years. Communicate witnAlden, care of Kastor's,St. Louis, Mo. WANTED—A man or woman to act at'! our information reporter. All or spare time, No experience necces-sary. $50 to $300 per month. Nothing to sell. Send stamp for particulars. Hales Association, 693 Association f'.lii:. Indianapolis, Indiana. MISCELLANEOUS. THE LOXOGRAPH TRIANGUL AR RULER.- Saves time tracing mechanical drawings. Can be moved over fresh ink lines without blotting. Send for circular. Tbe Loxograph Instrument Co., Wilmington, Del. JUST INVENTED a bottle or cork that cannot be refilled after emptying, useful for ail liquids. Write for particulars. Address. J. Soula, Flat 10, 125 West 28th Street, New York City IN \- ENTO RS, our experience of ten years developing and building inventions is at ;.:ikt-service. Send for estimates, lowest h:ki^_ Ben;). itr. iwiim rin. Mechanical Engineer and r.iLi .i f t. Ellwood City, Pa. MOTORCYCLES CHEAP.—Send to-day for free catalog ol new and used motorcycles. Also motorcycle accessories and attachable motor outfits for converting bicycles into motorcycles, Shaw Manufacturing Company. Dept. 24, Galesburg, Kans. GINSENG Raising is the surest way to make Big Money on Little Capital. One acre will yield 5000 lbs. Sella at $6 a lb. I will buy all you raise. Grows anywhere. Requires your spare time only. If you are not satisfied with your pr' sent income. write me today. T. H. Sutton, 780 Sherwood Ave. , Louisville, Ky. MAKE BIG MONEY operating a Daydark Post Card Machine. Photo postal cards made and delivered on the spot in ten minutes in the open street, No dark room necessary—it does not require an experienced photographer to make first-class pictures. Pays a gross a catalogue. Daydark SpeeialtvCo., Dept. 2 V, St. Louis. FRE*K-"INVESTING FOR PROFIT” Magazine. Send me your name and I will mail you this magazlne absolutely free, Before you Invest a dollar anywhere — get this magazine — It is worth 110 a copy to any man who intends to invest f6 or more per month. Tells you how tl,000 can grow to f22.O00 —how to judge different Classes of investments; the ee six montbsfreo Ifyou wrileto-day. H. l'Barber. Publisher, 423, 28 W. Jackson Blvd .. Chicago. Frank Juliar. Sprague (Concluded from page 363.) Sprague developed the high-speed screw elevator, the automatic house elevator, the double motor drum elevator and other devices. While all this was going on Mr. Sprague had offered to run the Manhattan Elevated Railway electrically, but having to deal with progressives of the type of Gould and Sage, he did not get very far. Turning his efforts to Chicago, he there put into service on the South Side Elevated his “multiple unit” system, under forfeiture contract. Once more he made good, with startling results, so that not only in Chicago, for elevated railway work, the multiple unit system is the only one known, but it is the sole dependence of the roads in New York and Boston. Then came the Manhattan Subways, and all the river tube systems—every one an example of multiple unit application. Mr. Sprague's fundamental and basic patent on this contains nearly 300 claims, a good multiple unit In itself, and a fair exhibition of reticence on the part of a man who would rather talk and fight and invent any time than listen to musk and the drama—though he dotes on both. Of course such an inventor and engineer was early drawn into the work of changing over for electricity the big terminals of the trunk railroads; and hence he is found on the consulting staff of the New York Central. He was also retained by Harriman as to similar work on the Southern Pacific. In these developments he has been understood to stand strongly for the use of the direct current, against the alternating, as used on the New Haven road, but at the same time he has advocated hitting up the potential for direct current work, and has jumped it from 600 to 1,200 volts, with very satisfactory results. He has also been a stout advocate of the protection of the third rail, with devices exemplified on the New York Central and several other roads. More lately, Mr. Sprague has returned to the subway problem, by tongue and pen has advocated reforms and improvements, and has even offered to undertake, with full financial responsibility, the construction needed to relieve the frightful congestion on the older lines. There is not much of Sprague to look at, but it is all fighting weight, nerve, grit, go, snap and confidence. He has crossed the 50 line, but does not suspect it; and the dark hair, flashing eye, equi-line nose, sharply-cut chin, alertness of movement, tenseness of poise, all tell of a very live human being. He has an acutely mathematical mind, tempered, fortunately, by humor and imagination; but he is concentrated, and no matter what you may want to talk about, has no difficulty whatever in swinging the conversation back to the thing he is interested in. A more loyal and generous friend could not be imagined, but there are some persons he will omit from his will. To this day he maintains the keenest interest in the profession of his early years, and his appointment as visitor to the Naval Academy is still regarded by many conservatives as perhaps the saving feature of the Roosevelt administration. Relative Strength . of Italian and Turkish Navies (Concluded from page 371.) Of less important cruisers of the protected type Italy possesses ten, of from 2,250 to 3,500 tons, and from- 17 to 20 knots speed. 'Their. armament consists generally of from four to six 4.7-inch or 6-inch rapid fire guns. The navy includes two 23-knot torpedo cruisers and eight gunboats, the latter fitted for laying mines. The torpedo fleet is made up of twenty-three destroyers, of 28 to 30 knots speed and about 350 tons displacement. Also twelve destroyers of 620 tons and 30 knot speed are under construction. The torpedo fleet also includes eighty-one completed torpedo boats and thirty under construction. In the submarine flotilla are the “Delfino,” 107 tons, 6 and 9 knots, the five “Glaucos,” 150 tons, 9 and 14 knots, ' the “Foca,” 230 tons, 9 and 15 knots, and eleven vessels under construction or about to be commenced. At the present writing no engagements of any' importance appear to have taken The Postal Life Insurance Company pays YOU the Commissions that other Companies pay their agents 45%% 0f the lirst year's premium is the average Commission-Dividend being paid to each POSTAL policyholder on entrance into the company. Other companies would pay this sum to an agent— as his commission. That's for the first :year: in subsequent years POSTAL policyholders receive the Renewal Commissions other companies pay their agents, namely, 7%%, and they also receive an Office.Expense Saving of 2%, making up the Strong Postal Points first: Old-line, legal-reserve insurance — 110 t fraternal or 1 second: Standard policy reserve - now more than $10,000,000. third: Standard policy provisions — approved by the state Insurance department. Fourth: 7Vnwdiptxt St'iti'liird* iit \hp aeLitL'liifii of risks. but rffdnc*l by f^mnns-taon 'lii-idi'iiita, i/itnTitnt?*d iu policy, as • herein. Annual Dividend of Guaranteed in the Policy And the POSTAL pays the usual contingent dividends besides—ranging up to 20% of the annual premium. Such is the POSTAL way; it is open' to you. Call at the Company's offices or write now and find out the exact sum it will pay you at your age—the first :year and every other. POSTAL LIFE INSURANCE COMPANY The Only Non-agency Company in America 35 NASSAU ST., NEW YORK Assets: #70,839,000 Insurance in force more than #55,000,000 ' BUILT FOR PERMANENCE" $1800 flbboir rwiroir “44" A Standard American Car with the Best of Europe Added A symphony of mechanical excellence and refinement —that's the Abbott-Detroit “44", the sumptuous seven-passenger, fore-door, torpedo car built for permanence and guaranteed for life by the Abbott Motor Company, Detroit. The cardinal features here enumerated and which are frequently embodied in cars of the $4,000 type are seldom incorporated in cars selling at Abbott-Detroit prices. Exceptionally large and roomy body, hand buffed leather upholstery, with thick cushions; black walnut natural finish—dash and trimmings; highest class finish—24 painting operations; springs, oil tempered; three-quarter elliptic springs in tear, giving exceptionally easy riding qualities; full floating type rear axle; chrome nickel steel drive shaft; multiple disc clutch; three-bearing crank shaft; unusually large valve openings; Timken roller and imported Schaefer annular bearings throughout; extra large tires, reducing tire expense; gear shifting device noiseless, easily handled; large, strong, artillery wheels; latest type of fore-door body with inside control. This car IS THE SERVANT—not the MASTER OF ITS OWNER It is the policy of the Abbott Motor Company at all times and at whatever cost to keep its product representative of that which is best and most up-to-date in American and European automobile construction. We constantly work for the improvement in design and materials, and add the improvement the moment its particular reliability has been demonstrated, and at the same time proved to be a valuable adjunct of the car.” The rigorous application of this policy keeps the Abbott-Detroit line of models always timely and new. The customer does not have to wait for anew season in order to see predominating features of standard construction — refer to the Abbott-Detroit at any time — the standard car that's always up-to-date. Send for 1912 Art Catalog Abbott Motor Co., 613 Waterloo St., Detroit, Mich. 878 October 21, 1911 WIN' THIS $1200.00!, Thousands Already Won—Going on Daefy, TEN PEOPLE GET $40,000 They Tell You /low to Win. I IQTPM ! Stoneman(Nebr, photog'ph'r) LIOILI1. actually received $1300one month, $51.50 in 15 minutes, $800 in II days; Korstad (Minn, solicitor) $8212 in 2 weeks; Sevcgne (N. Y. telegrapher) $100 dally. Not a fairy tale, fako or humbug, but proven absolutely true by sworn statements. Government patronage, statesmen, judges,1 bankers, world's famed institutions,1 local references. Costs nothing to in- I vestigate. This gigantic money-making contest no longer controlled by a few—now open to any honest, industri- M et. ous man or woman. Big money made m' JlOneman by mechanics, clerks, farmers, teachers, doctors, lawyers, people from all ^ walks of life. Experience, capital,business training unnecessary. Yon can own, operate and control same private enterprise that broughtWilson(banker) *3,000 in 30 days; Kasp( agent) «1«85 In 73 days; Oviatt (minister) $4,000. Rogers (surveyor) $2800; Juell (clerk) $6800; Hoard (doctor) $2200; Hart (farmer) $5,000. Schleicher ( minister) $11)5 first 12 hours. Hundreds '' sharing similar prosperity — banking money, buying homes, automobiles. fl|. Juell Don t wonder. Same appointment should mean same money for you — same power, prominence, dignity, respect, influence. Kise to big earnings, wage freedom, ownership and private monopoly. Knowing the reason dispels all doubt. Wonderful, but true. Strange Invention gives every home a bath room for only $6.50; excels others costing $200, Abolishes tubs, bowls, buckets, wash rags, sponges. Turns any room into a bath room with hot or cold running water. Think of itl So energizes water, one gallon ample; cleanses almost automatically; no plumbing; no water-works; self-heating. Gives cleansing, friction, massage and -~ shower baths. So simple child can operate. Truly marvelous. A modern home-bathing without drudgery, inconvenience, muss or lugging water, filling tubs, emptying, cleaning, putting away. Could anything be more popular ? Think of millions who want bathrooms 1 At sight people exclaim: ''There, there, that'swhat I've been longing for.” Little wonder Wilson sold 102 in 14 days; Hart, 16 in 3 hours. Think what you could do. Come— fall in line—make a fortune. Don't let another get there first. Tour chance now to secure exclusive sale. Devote all or spare time. Means phenomenal earnings; no competi-t i o n; fascinating, high-grade business-Credit given active distributors. Send no money — investigate first. __ Send to-day lor remarkable offer—it*s valuable but free. Address ALLEN MFG. CO., 3391 Allen Building, TOLEDO, OHIO CAN YOU HUNTS every shot goes straight to the mark. Makes trigger work right—keeps barrel bright inside and out. Write to 3-IN-ONE OIL CO., 42 A Z G, Broadway.New York City, for generous sample bottle—FEEE. ROTARY PUMPS AND ENGINES • Their Origin and Development An important series of papers giving a historical resume of the rotary pump and engine from 1588 and illustrated with dear drawings showing the construction of various forms of pumps and engines. 38 illustrations. Contained in Supplements 1109, 1110, 1111. Price 10 cents each. For sale by Munn&Co ., Inc., and all newsdealers. DURYEA BUGGYAUT No other rig in its class for practicability. Unsurpassed in simplicity. Send for printed matter. C. S. DURYEA AUTO CO., SAGINAW, MICH. lilif'Ttl'IIJIlH Corliss Engines, Brewers and Bottlers' Machinery ShVILTER MFG. CO. 899 Clinton Street, Milwaukee, Wis. ItlBRlUTlsVo"? Anything ----118.184 North Clinton St. CM BES tva CO EK'&Wt.USA Expert Manufacturers Fine Jobbing Work PARKER, STEARNS&CO., 288-290 Sheffield Ave., Brooklyn, N. Y. RUBBER DADVCD CT Your PATENTS and BUSINESS : ARIZONA Incorporate Laws the most liberal. Expense the least. Hold meetings. transact business anywhere. Blanks. 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Ourschool is one of the largest and best-known home instruction institutions in the world—teaching all branches of Business and Engineering. TUITION PAYABLE OUT OF INCREASED SALARY WE ENABLE YOU TO EARN. Write today for illustrated booklet: “FROM FOUNDATION TO FLAGSTAFF “-it tells you how to make the light start. AMERICAN SCHOOL OF CORRESPONDENCE Dept. 220 Chicago, 111. place between the two navies, and it is not likely even in the event of a protracted war, that the struggle will shed much light upon the leading naval problems of construction, tactics and strategy. Small Isolated Electric Power Plants (Concluded from page 372.) main battery. Each cell may consist simply of two plates of sheet lead suspended in a jar of electrolyte. At W is indicated a variable resistance which must be used during the process of forming the home-made battery previously described. This will need to .'have a resistance of about seven ohms and a current-carrying capacity of six amperes. When the switch, S, is closed to the left it connects the battery directly to the load through the upper blade. The lower switch point is not used for anything on this side, tout its clip makes, a most convenient place to keep a spare eight-ampere fuse. When it is desired to charge the battery the dynamo is started, and, by manipulation of the field regulator, R, is brought up to a voltage sufficient to light the lamp, V, to about half its candle-power. The switch is then thrown to the right, connecting the battery to the dynamo through the upper blade, and both battery and dynamo together to the load through the lower blade and the three c. e. m. f. cells. The charging of the -battery may be done during the day or at night, as may be most convenient. When fully charged, a 36 ampere-hour battery will run seven 16 candle-power lamps for eight hours, and it will require a current of five amperes for eight hours for the recharge. Assuming an average evening's use of four lamps for 3% hours it should suffice to charge the battery twice a week. In winter, when the evenings are long, it may need to be charged every other day. On occasions of unusual demand, such as parties or receptions, to prevent the battery being exhausted too rapidly, it is necessary for the dynamo to be run in the evening to carry a part of the load. The same thing is true in cases where it is desired to use an electric flat-iron or vacuum cleaner, which easily can be done by keeping tlhe dynamo going all day on “ironing day” and “cleaning day." The foregoing specifications, as stated in the beginning, apply to a small sized installation where lighting is the principal requirement. Before installing a 32 volt plant, careful consideration should be given to the subject of future extensions. Electric cooking and other heating appliances, motors and the like not only require a larger plant to run them, but it is desirable to operate them at a higher voltage in order to keep down the size of the copper conductors necessary to carry the large currents imposed by low voltage. Ji1or larger -plants sixty volts has been adopted as a standard, and makers of lamps, heating appliances, etc., now carry these in stock made for this voltage. The following specifications will give a .good idea of what is needed for a 60 volt plant: Battery, 30 cells two-plate type 36 ampere-hours capacity and 6 c. e. m. f. cells, or 60 cells of the home-made battery, connected thirty in series and two in multiple, with i(i c. - e. m. f. cells all in series. 'Generator, shunt wound dynamo 77 volts, 5 amperes, speed about 2,000 r. p. m. Engine, one horse-power. Ammeter, 10-0-10 scale; voltmeter, 80 volt scale. This outfit will 'have twice the capacity of the one previously described. It would be suitable for a connected load of forty 16 c. p. lamps where the maximum demand is limited to twenty-five. The battery alone will be large enough to handle light intermittent loads through the day, such as coffee-percola-ter, electric toaster, or a one-half horsepower pump motor for the house tank supply. This outfit is adapted for future enlargement by the addition of more battery, but if this is anticipated in the very beginning it would be better to install a larger charging equipment—say a. 2 horse-power engine with a 77 volt 10 ampere dynamo, and to have the ammeter scale marked 20-0-20.