Hendricks's Commercial Register of the United States. For Buyers and Sellers. New York: S. E. Hendricks&Co., Inc., 1914. 4to.; 1,596 pp. Price, 10. The Register is a bulky volume of compact information whose index alone occupies 138 pages. It would be hard to find an article of commerce or industry, from canned goods to portable houses, that is not listed. In any classification which carries a large number of names, as, for example, architects and boilermakers, these names are segregated under their native States, so that reference to particular sections of the country is greatly facilitated. The work includes some 350,000 names and addresses, with 55,000 business classifications. To any whose business interests are connected directly or indirectly with such industries as contracting, engineering, hardware, iron, mill, mining, and railroading, the Register offers a fund of accurate information that is of prime importance both to buyer and seller. Six copies are in constant use in the Scientific American office, which is a sufficient indication of its value. The Mahin Advertising Data Book. 1913-1914. Facts and Statistics in Condensed Form for the Man who has Advertising a nd Merchandising Problems to Solve. Chicago: A. C. McClurg&Co. Price, 2. Perhaps the chief feature of this invaluable little pocket book is the list of towns in the United States and Canada, listed alphabetically by .States, and giving population, location, advertising mediums and rates. The population of each State, the number of street cars and the population they serve, and full and half-run rates for street car campaign, are also noted. There are some admira ble li ttle articles on advertising practice and principles, and a discussion of types, with illustrations of those most in use. Another eminently useful compilation is that of the leading magazines, trade journals, and religious publications of the country, with their circulation, dates for closing of forms, the size of page and width of column, and their advertising rates and discounts. A dverti ser s and salesmen will, by keeping these data at hand for constant reference, save much time and increase efficiency. The ten tests .applied in judgment of advertising value may not be passed by without a word of appreciation. Mechanical Properties of Wood. Including a Discussion of the Factors Affecting the Mechanical Properties and Methods of Timber Testing. By Samuel J. Record, Assistant Professor of Forest Products, Yale University. New York: John Wiley&Sons, 1914. 8vo.; xi165 pp.; 51 text figures and half-tone plates. Price, 1.75. This is a book intended primarily for the use of the student in forestry. Also, the book may well serve as a guide for the mechanical engineer or wood user who wishes to become more familiar with the proper ,ies of wood. After a brief introduction, the work very properly begins with the fundamental considerations and definitions which are all reduced to the simplest terms, and without reference to higher mathematics, with which the students are often unfamiliar. This is followed by 46 pages of description of the factors influencing the mechanical properties of wood. Among these are rate of growth, heartwood and sapwood, weight, color, grain, knots, splits, injuries by borers, fungi, water content, temperature, and preservatives. About 10 pages of this chapter are devoted to a consideration of the general elfect of the water content upon wood substance. Following this is a brief discussion of the methods employed in preparing and testing the timber and recording data. The methods recommended are for the most part those followed by the United States Forest Service. The whole book is very systematically arranged aud furnishes abundant material for study by everyone who is interested in this important branch of forestry and engineering. There is appended an extensive bibliography made up of books which will be very helpful to those who wish to refer to more complete discussions on certain phases of this subject. Not only are the most familiar books cited, but also a large number of more or less obscure works which are excellent sources for further information. A number of the German and French works given are not readily accessible, however, except to those who are located near large libraries. M ECHANICA L MOVEMENTS, POWERS AND Devices. By Gardner D. Hiscox, M.E. New York: The Norman W. Henley Publishing Company, 1914. 8vo.; 409 pp. Price, 2.50. This volume has been revised a number of times and brought up to date. It contains a large number of valuable mechanical movements and devices, many of which are not found elsewhere. The principal criticism is that the illustrations are dissimilar in character, some of them being catalogue cuts, and others are taken from various technical publications, including the Scientific American and the Scientific American Supple me nt. Perhaps it would have been better had all of the illustrations been reproduced uniform in pure line, preferably by the wax process. Mathematics for Freshmen Students of E ngineering. By Theodore Lind-quist. 135 pp. A dissertation submitted to the faculty of Ogden School of Science, Department of Mathematics, University of Chicago. LA THES AND SMALL TOOLS CTAP LargeLioeof SI AR Attachment, For Foot I ATUCC or Power LA ItlES Suitablefor fine accuratework in the repair shop, garage. tool ' room and machine shop. Send for Catalogue B SENECA FALLS MFG. CO.. 695 Water Sired Seneca Falls. N. Y.. U.S.A. For Gunsmiths, Tool Makers, Experimental&Rep air Work, etc. From 9-in. to 13-in. swing. Arranged for Steam or Foot Power, Velocipede or Stand-up Treadle. W . F.&J. Barnes Co. Established 1872. 1999 Ru by Street Rockford, III. Strong Patent Diamond Holder The up-to-the-minute Holder--wIth six points and a shock absorber. Worth knowing about. Send for circular. MONTGOMERY&CO.. Tool Mongers 105-107 Fulton Street New York City IMPROVED Combination Lathe for mechanics, model makers, experimenters and amateurs. Hollow steel spindle. The foot motion is of the improved grasshopper type. Circular saw has iron saw tabl e perfectly adjusted Guide and slide move to and fro readily. and are alway:; true to the saw. Slide may be set at an angle. 45, 50, 55 and 60. A. J. WILKINSON&CO. Machinery. etc. 184-188 Washington St. BOSTON. MASS. RED DEVIL No. 1024 6 A HANDY SLIP JOINT COMBINATION TOOL Adjustable for large and small pipes, etc. Thin nose makes it easy to get into close places. Gun metal, den-tynemilled handles. At your dealer.or send 50cents for one sample only. Send fur Booklet 3000 Red Devils." SMITH&TTEMENWA Y CO.. Inc. 155 Chambers St. New York City You May Crowd a CRESCENT JOINER o t he limit of opacity nn1 the mivchine will do ivorl; just as smoothly is thoiii!h yon had DO'; ruwded it at all. Bnil\ u six si1.es. Sent! for catalog telling ill aboiitthem and describing our line f Kniid Suns. Snw Tulilea, Planers, 'luni'i's rnni Olultjiers, Shape", tiring Suns, Ilnrers, Disk Grind-n-s, Viuli'ly tV<.ol Workers. THE CRESCENT MACHINE CO., 230 Main St., Leetooia, Ohio ELECTRIC Ds SPECIAL Grinden MACHINES PoIiiheri ROTH BROS.&CO. 198 I .'inn Street, Chicago I You like to go HUNTING FISHING CAMPING o ATI UNAL SPORTSMAN Magazine, with its 160 richly illustrated [.: -- full to over-(lowing wi ihj interesting stories ami valuable information about gnus, rushing tackle, camp out-lits--the est places to go for fish and game, and thousand utid one valuable How to hints for Sportsmen. The NATIONAL SPORTSMAN is just like !l big camp fire in the woods where thousands of good fellows gather once a mouth ami spin stirring yarns about their experiences with d, ilug, rille and gun. All this for 15c a copv or 1.00 for a whole year, ith watch fob. Special Offer Mail us 25 cts. in : stamps or coin for a 3 uionths'triul subscription to the NATION A L SPORTSMAN and we will send you absolutely Free of Charge one of our handsome Oruiulo Cold Watch Fobs, as here shown, with seal grain leather strap and gold-plated buckla- Don't Delay--Send your order Today. NATIONAL SPORTSMAN, 64 Federal Sl, Boston, Mass. "AMID all the varied claims that are f-\ set forth in the pages of every magazine, how am I, who do not possess a fund of technical knowledge, to tell which car to buy? This chance remark suggested this advertisement. "How Am I to Tell Which Car to Buy?" 1 Know the Company-- For seven years the Chalmers Motor Company has been recognized as one of the strongest companies financially in the automobile industry. Its organization and methods are acknowledged, even by other makers, to be unexcelled. During these seven years it has introduced many of the most noted improvements in motor car build ing. 2 Then the Factory--Chalmers cars are manufactured cars. Every essential part is made completely in the great Chalmers plant by nearly 4000 men working on the Chalmers principle of Quality First. The millions invested in the most up-to-date machinery and latest special equipment for building special Chalmers features are the best pledge we can give you of the faith the Chalmers Company has in its product. 3 The Record of the Car with Owners--40,000 Chalmers cars now in use prove Chalmers principles of motor car construction right. We sincerely wish that you could talk with these 40,000 owners. Then you would have ample evidence that Chalmers cars are the greatest automobile values offered within several hundred dollars of their price. Nearly 10,000 owners in all parts of the country have demonstrated in actual road service that both the Light Six and the larger Master Six stay put and keep sweet-running even in the hardest ki nd of usage. 4 The Style in the Car-- People turn to admire Chalmers cars. They stand out from others through their superior style and smartness. From the graceful radiator and sloping bonnet, throughout the beautiful bellback, streamline body, Chalmers Sixes possess a distinctive style and a different kind of automobile beauty that makes owners proud to say, My car is a Chalmers." C The Special Features--Among many special features Chalmers cars have non-stall-able, six-cylinder motors with practically noiseless Chalmers-Entz one-motion starter; molded oval fenders of greater grace than flat or merely crowned fenders and so firm and sturdy as to save the car from bumps or knocks; larger tires than usual with Nobby treads on rear wheels; wide, flush-fitting doors; deep-upholstered seats sloped to give utmost comfort; and every detailed improvement and refinement known to the most up-to-date automobile building. Point by point comparison will show you the big over-value in Chalmers Sixes at their price s. With these 5 points in mind consider the dot7ar-for-doar vaue in the car. Chalmers cars have always given big value for the money. Chalmers owners will tell you that each year we have made Chalmers cars bigger values at the price. But in the 'Light Six and the larger Master Six there is greater automobile value than we have ever offered--greater value, we believe. than any maker has ever offered at anywhere near the price. Automobile buyers, in greater number this year than ever before, find in these reasons for buying a Chalmers Six" the best answer to the question, ' How Am I to Tell Which Car to Buy? Our shipments thus far this season exceed those of the same period of 1913, which was the biggest Chalmers year. The satisfactory answer in the 1915 Chalmers Sixes to the question above has made these our fastest selling cars--The Most Successful Cars of Seven Successful Seasons. 'Quality First" "Light Six"-1650 2100 F. O. B. Windsor "Master Six"--2400 Fully Equipped, F. O. B. Detroit Qialmers Motor Company, Detroit The Greatest Inventor and His Greatest Invention THE EDISON STORAGE BATTERY as G re a t an a d v an Ce in W Or l d pro g res s as was the E dis on InCAND escen t L a M p. In Only Five Years of Commercial Life it is now Used to Propel over One-third of all the Electric Trucks in America. Thousands in Use by the Army and Navy, because of its Dependability, Durability, and Ruggedness. Exclusively Adopted for Train Lighting and Signal Operation by the Majority of America's Greatest Railway Systems. It is Rapidly Coming into Extensive Use by Steamship Companies as the Most Dependable Source of Power for Emergency Lights and Wireless. Used Exclusively by Many Electrical Engineers and Contractors for Lighting and Power in Country Homes and on Farms. Rapidly Displacing Other Batteries for Use on Industrial Freight Trucks and Mining Locomotives. The Submarine Type Has Been Recently Completed and its Rapid Adoption in This Service is Assured. Guaranteed to Develop 100 Rated Capacity at the End of Four Years of Continuous Service. Built Like A Watch But As Rugged As A Battleship EDISON STORAGE BATTERY CO., 132 LAKESIDE AVE., ORANGE, N. J.