The Electrical experimenter

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64 THE ELECTRICAL EXPERIMENTER May, 1917 A Motor and a Rotor for $5.25 We have built 5000 of these outfits, consisting of a motor that will operate on a. c. or d. c, 5000 to 6000 r. p. m., 100 to 130 volts. An aluminum rotor, perfectly balanced, machined and insulated. The MarV-o' Quality One-half actual size IS a storage battery. ^s^ Regular price of these outfits, $8.50 Introductory offer as above, while they last. Act quick. $4.00 Motor only $1.50 Rotor only When ordering rotors give size of shaft The Fosco Corporation 1355 N. Western Ave., Chicago, 111. Send postage jor catalogue oj motors and supplies An Opportunity for Experimenters to secure a GOOD storage battery at a moderately LOW cost. The ONE article you cannoc afford to experi ment with ^^— /î:o^ e'ttt >cO .-xo^. Typo 4C2 6C2 6C4 6C6 MARKO storage batteries are especially adapted for op>eration of kinds of spark coils, insuring a heavy and powerful spark. There is nothing superior FOR AUDION USE VoltB Amp. H.R List Special price to Capacity Price wireless eneineers 4 40 $ 7.00 S4.90 6 40 10.00 7.00 6 60 12.00 8.40 6 80 16.00 11.20 PAUL M. MARKO & CO^ Inc^ 1191 Bedford Atc. Brooklyn. N.Y. N. Y. Depot—974 8lh Ave.. N.Y.City New Indamped Wave Coupler No. 749 special latrodnctory Price, $18.00 Our new coupler No. 749 is 32' long, 9' wide, and 10' high, over ail. and on an average-sized Antenna tunes to 15,000 meters. This coupler, used with the new CHAMBERS' SYSTEM or CIR- CUIT, will bringin signalsfrom domestic and foreign Arc Stations surprisingly loud and clear. Note the difference In size of our No. 748 and No. 749. We claim to be the original inventors of a SYSTEM or CIRCUIT for the reception of the undamped waves without the use of Loading Coils or Oscillating Colls, as thev are sometimes called; as with our SYSTEM or CIRCUIT only two Inductively Coupled Coils are neceBBary. Circuit supplied This ^HAMb1;RS' circuit saves you money. II. IS lo pay for. and price of coupler only SlS.Oti Place order the introductory price. Orders filled in rotation. Send for B. CHAMBERS & CO., 2046 Arch St., Phila., Pa. *• THERE'S MONEY IN IT** i^gîLEARNTELEGRAPHY^sSfil^ LRN TELEGRA „^niMORSE AND WIRELESS: TEACH YOURSELF in half the usual time, at trifling cost, with the wonderful Automatic Transmitter. THE OMNIGRAPH. Sends unlimited Morse or Continental niessa,t;es. at any speed, just as an expert operator woiil i. Adopted by U. S. Gov't. 4 styles. Catalogue free. OMNIGRAPH MFG. CO. 39L Cortlandt St. New York You benefit by mentioning "The Electrical Experimenter" when writing to advertisers. L. J. W G. L. L. P. J. S. R. E. L. H. R. E. H. H. Williams, 4 CY, Covington R. Shumate, 4 EC, Tomasville . B. Pope, 4 A.A., .Athens IXDIAX.A.. Decker, 9 QXO, Ligonier B. Wilco.x, 9 KH, .Angola Gehring, 9 .\.AS, Bluffton K. Romey, 9 QR, Columbia City E. Williams, jW, La Grange ILLIXOIS, W. Pierson, 9 PY, Carrolton H. G. Mathews, 9 ZX, Chicago E. Boynton, 9 ARA, Sycamore .•\. Kern, 9 GY, Matoon Klaus, HK, Eureka W. Beard, 9 GK, Pleasant Plains H. Giddings, 9 MK, Lanark A. Mackley, 9 AIM, Peoria IOWA. W. E. Slauson, 9 AMI, Monticello H. O. -Ainsworth, 9 AMI. Monticello S. U. of Iowa, 9 Y.A, Iowa City Don Bailey, 9 RD, Clinton Lester Fawcett, 9 .AIF, Independence C. Tumwall, CT, Ottumwa W. Harper. WH, Ottumwa H. M. Ennis. H./IE, Ottumwa Kent Bros., 9 .ARE, De Witt "The Old War Horse," 9 RD, Clinton KAXSAS W. S. Ezell, 9 YE, Wichita Karl Keller, 9 ADE, Kinsley LOUISIAX.A. P. E. Grenlaw, 5 BB, Franklinton MASSACHUSETTS. R. T. St. James, I IZ, Great Harrington P. C. Smith. Haverhill E. B. George. 1 .AX.A, Framingham B. H. Moran, 1 AAM, Natick MIXXESOT.A. Peter Hansen, PH, Chisolm MICHIGAX. T. L. Munger, LM. Sturgis "W. Benson, 8 .AXR, Battle Creek Ed. Holbv, 9 OE, Marquette Y.M.C.A.; 8 QJ, Ann Arbor -M. B. Rann, 8 .ADR, Lansing W. Koivanen, WK, Chisolm D. G. Carter, 8 WR, Grosse Point MISSOURI. W. Corwin. 9 .ABD, Jefferson City Washington University. 9 XV, St. Louis H. Longmire. Monroe City B. Emerson, Monroe City M.ARYLAXD. C. E. King. 3 SV, Baltimore E. B. Duvall, 3 .AK, Baltimore A. P. Smith. 3 .AK. Baltimore L. W. Passano, Marconi Operator, M. & M. Co., Baltimore MOXTAX.A. .A. C. Campbell. 7 ZC, Lewiston XEBRASKA. Bradford Telepea. Xo Call, Tekomah XEW YORK. J. X. Simpson, 8 CM, Rochester W. C. Ballard, 8 XU, Ithaca Genesee Radio Station. 8 OZ. Rochester Dr. H. E, Fitch, 8 ZE, Elmira O. W. Saxton, 8 FY, Buffalo A. C. Young. 8 .ARB, Buffalo H. Blower, 2 HB, Brooklyn Kenneth Briggs. 8 MG. Rochester T. Weiss. 2 FH, Port Washington G. M. Benas, 8 QC. Utica W. J. Vickery. 8 SE, Gloversvillc J. K. Hewitt, 2 .AGJ, .Albany XORTH CAROLIXA. W. S. Rothrock, 4 DI, Winston Salem J. T. Moorehead, JM, Greensboro OHIO. Fred Travis, Defiance R. Hoffman, Defiance D. Israel, 8 .AXC, Cincinnati G. D. Ilowsare. 8 .ASG. Eaton {The balance will be publisht in the June issue.)
May, 1 91 THE ELECTRICAL EXPERIMENTER 65 Are you with the country or against it? If you own a radio outfit it behooves you as a patriotic American to offer your Wireless Station to your country. Vou do not obligate yourself in any way by signing the blank printed below, except that you give the Government permission to operate your station at any time its officials may see fit to use it. Thousands of .Amateurs have thus Are You An American? pledged their stations, WHY N'OT YOU? Sign the blank to-day, and it will be promptly forwarded to VVashington. (See also page 3, this issue.) Join the Radio League of America: no fees, no dues to be paid. By joining you get a free membership certificate printed in green and gold. Send stamp for large eight page information booklet. Radio League of .\merica, 233 I'ulton Street, New York City. gllinilllllllllllllllllltllliniMIIIIIIIMMIMIIIIIIMIMIIIinilllllllllllMIIIMIMIIIIIIIIIIClllllCIMIIIIIIMIIIIIIIIIIIIIIIIIIIIIUIIIIIIlnllllllltlMIIIIIM I I Application for Membership in the Radio League of America I ^* THE UNDERSIGNED, a Radio Amateur, am the owner of a Wireless | = ^\ illation described in full on the face of this application. My station i = ^--'* has been in use since , and I herewith de- = I sire to apply for membership in the RADIO LEAGUE OF AMERICA. | = 1 have read all the rules of the LE.AGUE, and I hereby give my word of | n honor to abide by all the rules, and I particularly pledge my station to the i 5 United States Government in the event of war. if such occasion should | = arise. = g I understand that this lilank with my signature will be sent to the = 1 United States Government officials at VVashington, who will make a record | I of my station. | = Witnesses to signature: Name = I City j i State I I Date 191 = Describe the apparatus of your station on the blank below. = s In the event of national peril, you will volunteer your services as a = S radio operator in the interest of the L'. S. Government? j I This last question need not be answered unless you so desire it. i I Description of My Station and Apparatus = Sending Receiving l]IIIIIIIIIIIIIIIIIMIIIIIIIIIIIIIC]IIIIIIUIIIIIIIIIIIIIIIIIIIUIII[:MMIIIIIIIIIIIIMIIMIIIIIIIIIIIIII[]|||||||||||||||||||||||||llllllinilllllllllllllMIIIIIMIIIII^ CUT OUT, FILL IN, AND RETURN AT ONCE DISTRIBUTED CAPACITY AND ITS EFFECT. (Continued from pocjc 33) of the June 1916 issue of this journal. For those who have not seen this copy, the accompanying reproduction is made, Fig. 5. The construction is very simple and the drawing is self-explanatory. The effect of distributed capacity and dead-end effect is more pronounced in long coils and it is advisable to wind such coils in sections as shown in Fig. 6. It has been found that a considerable amount of distributed capacity is eliminated by such a method of winding and it should be done in every case where it is possible, especially on secondaries of loose couplers. The reason for reducing the distributed capacity is self-apparent, as the capacity varies inversely as the thickness of the dielectric between the conducting mediums. Thus the capacity is reduced by increasing the distance between sections. It will be an ideal inductance if each turn of the coil is separated from its neighboring turn, say, onethirty-sccond of an inch each. The distributed capacity of such a coil would be very small as compared to a coil with the wires close together. j "You Get The Job" "We've been watching you, young man. We know you're made of the stuff that wins. The man that cares enough about his future to study an I. C. S. course in his spare time is the kind we want in this firm's responsible positions. You're getting your promotion on what you knoiVy and I wish we had more like you.** The boss can*t take chances. When he has a responsible job to fill, he picks a man trained to hold it. He's watching you now, hoping you'll be ready when the opportunity comes. The thing for you to do is to start today and train yourself to do some one thing better than others. You can do it in spare time through the International Correspondence Schools. OverSOOOmen reported advancement last year as a result of their I. C. S. training. The first step these men took vvas to mark and mail this coupon. Make yo7ir start the same way—and make it right now. I. C. S., Box5346, Scrfinton, Pa. nNTERNATiONArCORRESPONDENCE SCHOOLS Box 534 6, SCRANTON. PA. I ' Explain, without obligating me. how I can qualify for the position, or In the subject, before which I mark X. I ELECTRICAL E>GL\EC[l Electric Lighting Electric Car Running Electric Wiring Practical Telephony Telegraph Expert flltl'llAM) \1, t.\(;INHR Mvchanicjl Draft*.man Îachine Shop Practice Gas Engineer nVlL L.NtJi.NEER Surveying and Mapping MINE KOHF.UW OK E.NtJ'R Urlallnrirlst or I'ro«p**tor srArin>AitY enui.neeb Marine Engineer ARCHITECT Contractor and Builder ^. ArrlihiTtiirttl ilraftamao ^ Concrete Builder ^Structural Engineer PLl'MIIIX; AMI HEaTISG Sheet Metal Worker JOIIEUIIAL ELNGLSEEB Name. Occupation i Etnployer_ Street and No.. You benefit by nicntwuvig "The Electrical Expcnmenter" when writing to advertisers. ISALESMANSHIP ADVERTISING MAN Window j Trimmer JShow Curd Writer Outdoor Sign Painter I IRAIl ROADER ilLI.lSTR ATOR IBtM>KKEErER Slrnoeraplivr and Trpl»t Cert. Pub. Accountant Railway Accountant Commercial Law GOOD ENGLISH j Teacher fottmon School Sobjrrtj PCIVIL SERVICE TRailwav Mail Clerk r AC.RK:LLrLRE n rrxtll*- OTtTso^r or Snpt, n Navigator Q Spanbli G I'onlirT Ralilor G tirrraan n ll'TOltORILt:^ Er^nfh P U lata Bcpalriof ( If n&Dii) of Courvc jwx mat Is not la tbla llac, writo it tmlow.
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POPULAR o c d l5 CENTS 1 dJ) Lb ^ E
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May, 1 91 THE ELECTRICAL EXPERIMENT
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The Electrlcail Experlmeeter Puhiia
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JHEELKTRICftL EXPERIMEMTER H. W. 5E
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May, 1917 ELECTRICITY is being rapi
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