Scientific American 1941

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Thomas A. Edison's Latest Invention A Storage Battery Designed and Constructed from the Automobile User's Point of View ...

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BIotor for grmding, polishing, fans, sewing mtwhines for Doctors, Dl'ntists, Urn;!' �:)��:Il��l�d;�lfe!�$e;:'����f9���ei�� i �:�· tor and pulle:v 'olll)� $2. Only pel'feet small motor made. connection... 'Publishers '1. In this "can electricity" the solution s a mere liquid carrier ions-it has, O t speak, moods and tenses its own to catered the battery user. THE POWER CONTRACTOR'S FAVORITE ENGINE. two cylinder."��;::;;·1J-Neatest, simplest and be,t on Ithe market. On account the low voltage the cell, a vehicle battery given voltage must contain larger number cells than a lead battery, twenty-fonr lead cells being equivalent forty the nickel-iron cells of same ampere-hour capacity but the low voltage and comparatively high in· ternal resistance are disadvantageo1ls from the purely electrical rather than the vehicle point view., Athol., Chicago, This our 58th year.!!!_ and B K TYPES FOR MARINE AUTOMOBILE and STA· TIONARY ENGINES SEND FOR LAT EST BULLETIN 557 THE flOLTZER-CABOT ELECTRIC CO. Y. 361 roadway, New ork, or 625 Street, Washington, C. Don't scoff. /). Accepted the authority. , concern.01' for Mechanics find Tradesmen.iliu(', in. ]6. For user:" Blue Print Paper pply Lanting Machines for making blue print paper linen. The Express System Saves Money. Arrane-ed for Steam or Foot Power, Velocipede or Stand-up rrreadle. 1 for complete catalog today••teU8 all about how these high grade lilotors are built tbe largost plant the world devoted. Don't take the side shows and miss the main show i the big tent. STAI-:'RETT CO. M Broadway, New York B ranch Office. slow speed, high duty engine. HOLTZER-CABOT GAS ENGINE JUMP SPARK and M. makes Blue Prints, Black Prints and Brown Prints. BORBEIN AUTO CO. Lowest fuel cost for runs Gasoline, Kerosene- Distillate, Gas Alcohol and has perfect ubrication. Please mention the Scientific American when writing- advertisers through wide range, and may far hig]her than would safe with the lead battery. S ENTI AME RICAN A ttache(J sny water faucet will deyelop lip to according: s i ze pipe and W:ltB!' pre!;,�llre. - Every User Blue Prints Should Investigate the New EXPRESS System Blue Printing Automatic, saves half the cost. State your requirement\> and get our adVIse.00 SI'JIId tor 232 page catalog No.ven any inventor furnishing with model sketch and a brief description the device question.50, cnsh with or­ d(·r. SENECA FALLS MFG. Any mechanic can opprat e them easi Send for eatalol!. 25c. and states that pays better put over . each ' brought in- Istantly into u,e bal joint .. Starts easier and quicker than any other eng:ine, occupies less space, is ess cum bersome, with less vibration, therefore adapting for either stationary, portable traction use. "FREE" Write for Catalogue. Lowest cost because it delivers greatest available power per horse. Try One., Port Washington, Wis. Established 1872. ''''ashing . The cost of charging current, and hence also the ef· ficiency its recovery the discharge circuit, minor part the total ex· pense operating the vehicle and the low electrical efficiency the battery s offset its extremely light weight­ which 'not only lightens the construction of the vehicle, but increases the propor· tion "paying load" carried the same -and its ruggedness service., Philadelphia, Pa.• 46 "St " Foot aml ar Power Screw Cutting Au��t LathesFOR FINE, ACCURATE WORK Send for Catalogue B. 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CIENTTFTC A:\I ERTCAN Sf' PP1., Manufacturers, 417 West 15th SI. Sent FREE" A. One boy does the work four men. vehicle manufacturer using the battery reports that charged ex· hausted battery A·4 cellR the rate of 100 amperes for short tin1('. L O. WilliAMS BROS Ithaca.. i\'1ounted on wheels o�· tonl ls. 1\[0(., ROCKFORD, h. pipe. GILSON MFG. Catalog free.. 695 Water Street, Seneca Falls, Y. 918 Chestnut St. CO. In estimating the true commercial efficiency of road-vehicle transportation, the ton· miles obtained must compared with the total cost operation the vehi- cle, with due allowance for all-around reo liability. Easily lucked or released turning handle. 625 Wash ., Cincinnati, Ohio Fon G NSMITHS. oxclusively the manufacture 2. ('at nlog free. ]8-B. BABBITT METALS. THE TEMPLE PUMP CO. Send fOl Catalog I>o. Patents and 11 Paten secured. J\dive Ag'ents wanted.-SIX IMPORTA� T formulas. swin�. trolyte because the latter constant, chemically, electrically and physically. DE P'T , /"'K'# TAPES AND RULES ARE THE BEST. any battery any time for half the CO'lt bearing of new battery. water during long periods the life t>f the cell., 1 Legal Notices IN VENTORS are Invited communicate with Munn o., 2109 North Ninth St., 308 Park St. Eight sharp cut­ tmg edges. A E-For Sixty Ye:m' the Standard the WOJ'ld for Quality. regard to securing valid patent protpction for their in­ v Trade-:llarks and CopyrightM registered. A Free Opinion the probable patenta­ bility iTlventi�n will readily gi. Senel )'onr water pres;;nre and silt supply pipe. Send for Lathe Catalog. Write once for generous sample bottle and Magneto Bulletin. l3-in."w York and London. MIC . THE SEBASTIAN IS-INCH ENGINE LATHE HIGH GRADE LOW PRICE Automobile Builders. With engines llorse powerR.blisbed 18IiO-ALOl<: Civil Engineering and Surveying Instruments DRA WING MATERIALS SIJPPLIES B . Price cents. with provision for circulation elec. Yearly subscription, $3. In charging, the rate can varied 3 One not too heavy-will positively not gum clog, collect dust dirt, harden dry out. It will not run out and leave contact points dry. The nature the support rna· terials and the method applying the active material the plates enable the cell stand dead short circuits without injury. St. Price cents mail. ALOE CO. BAR ., Dept.,an Supplement 685.l1lal'. WILLIAMS, BROWN EARLE, Ine. engine made has wide range use. -Whereas the lead cell the constitu­ tion (proportions acid and water) con· ductivity and specific gravity all undergo definite changJe during the cycle of charge and discharge, the Edison cell these ql,lalities remain unaltered. CRAY MOTOR CO. THE EDISON CONCRETE HOUSE q How constructed. W. CO. A. Both free..cyc1e motorS. stated that the cell im· proves use, instead deteriorating, and the company guarantees renew 3 One clear oil compound absolutely pure with just enough body oil perfectly the most delicate or sensitive action point. 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"Boosting charges"-given a vehicle battery when partially dis· charged, carry through a longer _period than its prescribed day's work-may given for hour's run at a rate two three times the normal charging rate and regular charge may be completed hurry starting at a high rate and gradually dpcreasing the rate. pipe, Ibs., L'".r MUNN COMPANY, Inc.00. For sale uno Co• Inc. YOU WILL MAKE MISTAKE YOU NOT WRITE FOR INFORMATIQN. WE LL DRILLING MACHINES Over sizes and 8tyles, for rilling either deep or shallow wells any kind soi rock., 50c. pressure, in. ���. Manufactured the The Ke)Jstone Safety Starling Handle Co.l:ulC>. D WAT MOTOR . Order from your newsdealer from . in. Net price $5, cas witlt orrle-l'. , 4" Walnut Street, Philadelphia, Pa. The Bible ofthe aero enthusiast, experi­ menter, builder, aviator and advertiser.. Louis, Mo. Scale drawings of mac hine, construction details, subscribers' forum. MO�M. TOOL MAKERS, EXPER I· M ENTAL PAIR WO ETC. \-Vorl{s day NigJlt-makes prints any lenvth. a ONE OIL COMPANY, BROADWAY, New York City. Ours the Oldest agency for securing patents ; it was established over sixty-five years ago. Improved bucket wheel construction. Bill' THELOWESTCOSTENGINE ��{!i�\�;:�leasIest e machine operates, delivering steadier power than any other gasolIne engine, adapting especially for operating farm machinery, with better results and least waste grain. Sag naw; ich A.L, Write for Free Sample Manufactured by T Y C CO. 1492-4 in. 3 One contains carbon residue, foreign matter, acid, impurities like all cylinder (mineral) oils., LEIB ST. EMEXT 23., 507 Olive Street, St