The Ignition Hand·Book. By H. R. Van Deventer, E. E. Price, 50 cents. Defective ignition is a great trouble maker. The first part of this tract is devoted to the various ignition systems and equipment, and the methods of installing and operating them. The features of the high and low tension systems, popularly known as the jump·spark and the make·and·brook, are explained by text and illustration, and their respective adaptabilities, excellencies, and drawbacks are catalogued. 'fhe latter part of the trca tise is given over to a particular type of magneto manufactured by a Southern firm. The Steel Workers. By John a. Fitch. New York: Charities Publication Committee, 1910. 8vo.; 380 pp.; illustrated. Price, postpaid, $1.71. "The Steel Workers” gives us a series of vivid glimpses into the clanging, roaring, seething inferno of the min.-glimpses that, like the impressions on a running cinematograph flm, merge into one faithful picture of men eternally in action at hammer and furnace, at charging machine, stripper, and rolls. Sparks and vapors and molten iron create a backg,round spectacular in the extreme, but the men who toil before this scenic display for twelve hours each day are conscious only of a stern, prosaic duty to be done in the face of ever·present dangel, with a weary body at the day's end. “Homestead,” Margaret Bying· ton's contribution to the Pittsburgh Survey, took up the family side of the employee's existence. “The Steel Workers” shows us the man in relation to his w()rk. Since the great strike of 1892, which resulted in victory for the emplayer, the subjugation of the employee has been complete, and men have been discharged for caIling meetings to discuss the issues which Mr. Fitch handles in the present volume. As one old resident said, “If you want to talk in Homestead, you must talk to yourself.” So Mr. Fitch takes up the cause of the man whose life is molded and fixed by the inexorable will of the steel kings, and leaves to others the interpretation of the steel industry from its administrative, commercial and technical sides. Metal Work and Etching. By John d. Adams. Chicago: Popular Mechanics Company, 1911. 12mo.; 88 pp.; illustrated. Price, 25 cents. This is a handbook giving a list of the simple tools and materials, with concise directions as to their use in the fabrication of such novelties in metal as desk sets, candle sconces, hinges, photograph frames, and jewelry. The designs are in excellent taste, and open up a large field of artistic handiwork to those whose choice falls upon occupations and hobbies of this kind. Heat. By j. Gordon Ogden, Ph.D. Chicago: Popular Mechanics Company, 1911. 12mo.; 119 pp. Price, 25 cents. There are doubtless many who will welcome a short, popular exposition of high and low temperatures in their relations to applied mechanics. Some of the phases of the subject which pass under examination are : Heat and its measurement; the production of low temperatures and their elects upon matter; the production of h1gh temperatures and their uses in connection with the rare metals ; the laws of expansion and contraction. There are also chapters on energy and fuels, artificial ice, and steam, boilers and engines. Thoughts on the Book of Revelation. By Uriah Smith. Washington: Review Herald Publishing Association. Price, 25 cents. The expounder argues that the very name shows this to be a book of revelation and not a manuscript of concealed meanings. He endeavors to follow what is known as the literal system of interpretation, taking words and phrases in their commonest significance Ind attempting to show that history has responded to the voice of prophecy. Under the Roof of the Jungle. a Book of Animal Life in the Guiana Wilds. By Charles Livingston Bull. Boston: l. c. Page&Co ·, 1911. 8vo · · 271 pp ., iliustrated. price, $2 net. It is indeed an “amazing landscape” which is here unfolded before us in description and illustration, and the dramatis personae are no less remarkable and sensati(nal than their background. Still, the Guiana jungles are places where the sensational becomes the commonplace. There are storios of jungle cats that !lay with rolled· up armadillos as a kitten plays with a ball; of troops of black spider monkeys, precipitating themselves from tree to tr('e in their terJo·r·stl'icken flight from the jaguar; of curious and deadly encounters in which birds, beasts and reptIles take part; of strange, loathsome little animals, of birds of ill·omen that follow a tapir calf for days, and of “green dragons” and “crested robbers” that lurk in foliage and prey upon the weak. Whether some of the situations into which the writer brings his animal actors are over-drawn or not we can not say, but he has certainly succeeded in making real to his reaqer some of the glamor, some of the mystery, and some of the horror of the haunts he describes. LEGAL NOTICES OVER 65 YEARS' EXPERIENCE de Marks Designs Copyrights c. INVENTORS are Invited to communicate with Munn&eo•• 301 Broadway, New York, or fj"a F Street, Washington, D. C , in regard to securing valid pntent protpction for their in-ventions. Trnde-ltfarks and (opyrig"tM registered. Design Patents and Foreign Paten ts secured. A Free O p i n ion as to tbe probable patentability of an invention will be readily given to any inventor furnishing us with a model or sketcb and a brief description of the device in question. All communications are strirtly confidential. OUf Hand-Book on Patents will be sent free on request. OurB is the Oldest agency tor securing patents; it was established over sixty-fi( e years ago. MUNN&CO., 361 Broadway, New York Branch Olce. 625 F St .• Washingtoll. D. C. PA T F M T <% SECURED OR FEE AT EJ' IS T Pa Sf RDTURNED Free re port a s to ''0 tpn tability. Illu8tratf'd G uide Book. and What I'o Invent with Li:4 of Inventions Wanted and Prizes offered for inventions sent free. VICTOR J. FV ANS&CO .• Washington, D.C. Classified Advertisements AdvertiSinc in this column hs 7;) cents a lane. No less than four nor more than 12 lines accepted. Count ieven words to the Jine. All orders must be accompanied by a remitlance. FUrtber informal ion Bent on request. FOR SALE. FOR SALK-Complete set Patent Office “Reports for toe year lS36 to 1871 inclusive. bound volumes of Official b azette from 1872 to 1900 inclusive, unbound volumes 1 n- 01 to date. All in good condition. Address P. O. Box B., Mamaroneck, N. Y. HELP WANTED. SUPERINTENDENT.-Metal Department of a large manu! a muring concern. One who thorfughly ung:ri st:nds the mak!ng and fin?Bshin' of articles Prlm sheet metaJs. No one who is not thoroughly experienced need apply. Permanent position to right party. Address Metal 'xpert, Box 773, N. Y. WANTED. - A first ' class American automobile machinist, to take charge. and to act as foreman in an up-to-date GarVee. Pleas: state experience. Address Youngs l Co., Newb,g, N. Y, PATENTS FOR SALE. FOR SALE. Patent No. 997,105. Improved valve for combustion engines. Is cheaper to build than poppet valves and is noiseless. Will sell outri Uht-on roralty We shop-righta. Address o. n reier, 3 lenth Avenne, New ?t: y. FOR SALE. Canadian Patent No. 131.917. U. S. No. 991.957, and Mexican No. II. 350, on a device which will keep trolley on the wire when round in!. curves. lor particulars wtite to Jfrank H. Crane. 2355 W. 38th Street, Cleveland, Ohio. THREE VALUABLE PATENTS lOR SALE, staple goods, hardware line. Articles already marketed. Good sellers, owner re!iring. :iculai.s onrequesr, addless EFard L. stone, 29 Weybusset St., Prcf:Nence, R. I. FO R SALE. U . S. Patent Noc. 997,227. Aut omf bilim.t. tool. Consists of lilt ing jack , pick, sbove l, hoe and pinch ba o . Nothing of its type or character on tbe market. A sure seller. Will sell outrigh t for $6,000. Address, F. i. Baird and William Peters, Jacklon, Cal. REAL ESTATE. lMPRO VED FARMS. J.arge or small, sevent h miles fror Chicago mai frets, co:aAe f:irably with the very best corn and whe:t, fa:ds in America. #1(t $100 per acre. Write for list. Robert D. Peters. Knox, Indiana. MUST BE SOLD. 1613 acres. higb a nd healthy. 900 timber, balance rentea for 40 hales cotton. Two miles to good schools, churches and depot. Timber worth double tie price, $35,000. Write or wire R. F. Hall, owner, Andersou, South Carollna. WANTED. LOCAL REPRESENTATIVE WANTED. Splendid income assured right man to act as our representative atter Jearning our business thoroughly by mail. Former experience unnecessary. All we reqUlre is hOnefty. ability. ambition and willingne8s to J' earn a lucrative business. No soJicitmg or traveling. J his is an excep . tional opportunity for a man in your section to get into a bi a paYIng business without capital and become inde-iendent for life. Write at Once for fgll farticulars. Address, E. R. Marcten, Pres. The National CJ-g':::: tive :e:O: state Company, L 378, Marden Building. WaShington, D.a._______________ M ISCELLAN EOUS. INTERESTED IN GASOLINE ENGINES? Send 5 l c for booklet,"How to RUT and Install Gasoline Engines.” nnr a year's subscription to Gas Energy, 21 Murray Street, New York. !RBK;''Ir 'EST1N? !oJPROFIT” MtZine. Send me your name and [ will mail you this m:g!zine absolutely free. Before you invest a dollar anywhere-get this magazine - it is worth $lU a copy to any man who intends to invest |5 or more per month· Tells X hgr ?is 000 can :ow to *2'J)o0 —how to ;udge different classes of ii 'I'stmentti he Real Il;arning Power of your money. This malazine six months free if you write tn-day. H. L. Barber. Pub-Usber, 423. 28 W. Jackson Blvd., Chicago. CIViL SERVICl EXAMINA'l'IONS open the war to Iood Government positions. I can coach you by yaiJ at small cost. Full particulars free to any Ameri n an citizen of eighteen or over. WrIte to-day for Bootlet E 40. Earl Hopkins. Wasbington, D. C. LISTS OF MANUFACTURERS. COM P I.ETl LIS'l'S of manufacturers in all linps ,upplied at. short notice Sf . wol1erafe rates. SmaU ann· special lists compiled to ( rder at vHrious prices Estimates shonld be ubtained in advanm'. .ddress M IIlln&Co .• Jnc .. List Jellurtmellt. Bo ox 773. !ew York. INQUIRY COLUMN Inquiry No. 9O. Wanted addresses of parties bavlng Pitcbblende depOSits, If able to sbip ore. Inqu iry No. 9257. Wanted addresses of firms selling second-hand water turbines. inqniry No. 925o .-Wanted addresses of parties having gem materials to offer in auy part of the world. Inquiry No. 02tO.-Wanted to buy a machine for r emoving the coatif o o: a filbert. h ° : ! ir; N:. r2o0.—Want addresses of partiesable to ship corund um, garnet, !lint, emery or any material suitable as an abrasive.