The ELECTRICAL EXPERIMENTER Is Puhtshl on the 15Th of Each Month St 2:13 Fulton Bons Cannot 1W Returned Videos Full Footage Has Been 'Minded
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When you finish reading this magazine place a 1 cent stamp on this notice, hand same to any postal employee and it will be NOTICE TO 4FADFR ' hands nl our soldiers or at Ìk sailors tar Iront. No wrapping -no oddrrs. -A. S. BURLESON. Postmaster -Gener. 7Uò MAR' OVER E51t v5 rx l l2 I75 CENTS haTE ILLUSI TRIM M, POP LILA>. ..l`:C`I ±',ICAL N EWS ILL.USTRATED U- BOATS USE BALLOONS FOR WIRELESS SEE PAGE 74 E, IPP LARGEST CIRCULATION OF ANY ELECTRICAL PUBLICATION www.americanradiohistory.com The demand for trained Electricians is immense. Fine positions are everywhere. Experts must be LADE--to fill them. This situation otters you the best chance you'll ever get to forge ahead (WICKLY in this greatest of all professions. Earn $2500 to $8000 a Year! QUALIFY for a splendid career through my course. It is sim- plified to the point of perfection. You'll enjoy it. I and my assistant engineers have worked to make it the most exact, simple, compre- hensive and interesting course in America. To show you how PRACTICAL it is -and PROVE you can learn Electricity with SPEED and EASE. I will send y;nl proof lessons- FRE -E OF CI IA R(ìE. Let a Practical Engineer Personally Train You at Home L. L. COOKE The well-known consulting and advisory engineer, for- merly member of Engineer- ing StaBs of American Bridge Co.. Pressed Steel Car Co.. and Millikan Bros.. great international engineers, in New York. London and So. Africa. [ w ill giee you the practical training you need - AT HOME. I will PE- RSON - \I.Ly train you in a ÌR KING knowledge of I:lectricity in your SP- \Rt- 'I IME. And I am so sun you will make a splendid success in the study of this fascinating profession -- that I will give you a GUARANTEE BOND to refund the full tuition cost to you. if you are not en- tirely satisfied when you receive your itIPI.1) I.\ unrd Electrician's Certifi- cate. Proof Lessons -FREE ! -Free Electrical Outfit ! i i .I (II I hear you at once I will send you the Proof LiAct quick and secure a big reduction in tuition. If from Lessons PREP. and I will also give you a big outfit of Standard size electrical tools, materials. etc.. abso- lutely FREE. Many other valuable benefits too numer- - - - - - - - -- - - - - - - - -I uus to mention. Send Coupon N( )W-for full detail. Don't fail a practical engineer can teach you the MAIL THIS COUPON I -only -- - - -- - - - - _ - -- -- - - things you \Il'ST knots to ttceccd big -and as Chief Engineer of the Chicago Engineering Works. I ant in a position to help you immensely. Send coupon or write today ,t " -, CHIEF ENGINEER COOKE Chicago Engineering Works DEPT. 23 441 Cass Street Chicago, III. www.americanradiohistory.com March, 1918 ELECTRICAL EXPERIMENTER i 3i . o r i EXPERIMENTERS! Student's Chromic Plunge Battery This Is an Ideal battery for eleetrie.l ..pert mental work u'h, re . : r.:; L. net reignited TI, e ws Iamb tor .stars] I nm a mall bay m,.. to tuna II I,rtr.gila nua w -rk; it I., oh al ha booing ark: It glues a fairly sl.aI)' rrrm and as the :Inc electrode can be pulled clear of the 'Wettable. nip materials are used when bat eery stands Idle. Bost Amalgam Zinc only tr mod! well a a highly porous carbon m `.Iradier current. MY. furrdsls s ongh' chromic salt. for 4 chem... Fulh directlona fur rpnnnl and r ..r hatlery Inrind,J Ea -h batten- Iris : lolls and I. amlarrs wl,,a'. nl an byres slimlid be drawn from bam.ry i-,eninuou,1,l r., these batteries. o areat malty experlooros gun L I .11 run 1.111 of tills buttery If ul-w1 by 'Ideal. partible battery. Sire enrr all 1... 2 Fl11gdna w.. No. 999. Si t trot's ITrhonlr i'tunu. Hatter,. IMMEDIATE SHIPMENTS $0.50 The "Electro" Radiotone HIGH FREQUENCY SILENT TEST BUZZER This Instrument gives a wonderful Ideh pitchedpitched \II Sit'.t I, %oTe' in the rm' fstrs, to ohlain Willi thr rdinary lest buzzer. The RAOIOTIlNE 'Is built along entirely new line.: It is NOT an nrtneay hnurr, reconstrueted In some manner. The 'CAI/INTONE has single Ou steel reed sthrat lilR at a remarkably high spend. adjusted to Its most efficient frequency at the factory. Il and rl tern enti. lasts are Used to stake the Instrument last prarlicxl j' fnr.-v.r. \m. the RAIHOTINE Is SILENT. In fact, It is an silent that you must plate your war nn top of It to hear its beautiful muslea I note. You Will be astounded at the wnnderlIdly Clear 5.0 cycle nor snunnam shandy in your receivers. To learn the codes. there Is absolutelyy nothing Ilk. It. with the radlotone. a key and one dry cell and ANY telephone. a One learner's srt is bad. Two or more such sets in srrirs will attend no end of pleasure for Intercommunication work. Shipping Weight I lb. Iln,haone as leserihed eaeb 'IMMEDIATE SHIPMENTS The "Electro" Telegraph bórmrTawsm ua.nwhatsuM 'Waal 14111 EurrIttlatrr is not a toy. Inn a tracheal, honestly built telegraph out ft. eldch not only sounds lint works like We Mg won lll onest instru- ments By .rlutb'Ina Idle code for 30 days sal c u h-ob, ir s first -class telegraph operator. Huth operators are Ill big de- mand now. thrttit nhlsists of TWO complete Ielegraph Instru- ments eatIl Ill. amount 314 U. x 2.. All metal parts are high- ly tlekel plated. Including key lever. Note hard rubber knob. smewniffigfiB( Telegraph Code d'hart. telegraph blanks and -ul rting Wire a ,m es Willi set. huh o hadrrls. OutOt work, 1 on 2 dryd cells )nlone well for each Instrument I. The "Eleetro" Is the ONLY OuI RI That works both way, each Mallon can call: no menthes. no xt9ra[s .11 Nothing to get o at t f order. Guaranteed In ihaae you r money . hack. Price Campl:t as IPustrat,d (TWO INSTRUMENTS).. `$ L \n ShlyylIng 2 Ibs. 1 Weight. 1s -p- ,yI IMMEDIATE SHIPMENTS '6 INWWIiYIui. JJl ..0 t3 The "Electro" Codophone (Patent, I'e,rdinrl What this r e m rkable $1.50 Iadrument Is and does. No. FX2on2 The "Dec- o.," Cedo- BOY'S ELECTRIC TOYS" contains enough mate - phone is Yli¡nill `©J "E - Ix Ills ly the Trial TO MAKE AND COMPLETE OVER TWENTY :.: r i my t otril FIVE DIFFERENT ELECTRICAL APPARATOS with ut m a d e out any oilier loots. except a servo-driver furnished with the outfit. The box that will complete instruments and apparatus which are :dread, imitate a Sun contains the following crele ti o 1 r assembled: exactly as rim. Sludtyal's chromic plunge battery, rmniumssRUlrammieter, solenoid, lelephon.' heard in a I reeelver, electric lamp. Enough various parts. wire, etc., are furnished 1.. Wireless re- make the following apparatus: enet. T h c. 1 ud- tahkIii r cricrr (quieted xieh a horn, talks sr, 1 1 (list can hear Electromagnet, electric cannon. magnetic dancing spiral. electric you ii pictures, ths sound all tover the room. earn If there is a lot of ether noise. hammer. galvanometer, voltmeter, hook for telephone receiver. condenser, THAT'S NOT ALL. By Itsacnina or lightening the receiver cap. tone sensitive microphore. short distance wireless telephone. test storage battery. (non the lowest, nnfleat quarry. up In the loudest mol Walled screaming shocking coll. complete telegraph set. electric riveting machine. electric buz- sound tan be dad In I (Pis saiib. FOR INTERCOMMUNICATION. l'siva ton dry relia for each Instru- zer. dancing fishes. singing telephone. mysterious dancing man, electric jump- ment. when connected with one alre return I but- hsa Cedephoess and ground. _- ing jack, magnetic geometric figures, rheostat. erratic pendulum, electric can he used for mtrrromnnudeatluu hem, n h Incas.. on. -hall tulle snarl terfly. thermo electric motor, visual telegraph, etc., etc. One u 1 alt done riqlaies alit- oldfashiiitted l learner's aiegphl set, con. This does not be any means exhnnst the list, but a great many more ap- slating of key and sounder. The "Eltrlm" Cadephen is haudsonte. well made Instrument, fool 'meatus tau be built netulll' 91111 effectually. proof. and built for hard work. flutter, are of hard aliter is Inch in With the instruction lantk sxldrh we furnish, one hundred experiments that diameter. that mull outla.1 the tu strmntnt. caul be made with this outfit are listed. nearly all of these being illustrated There Is Alen a teal c,dr chart and full direction. enabling any Intent- with superb illustrations. No other materials, goods or supplies are neces- 0-nt ysung roan er girl la learn the cedes within 30 des,. [damming sary to perform any of the one hundred experiments or to make any of Ili, liait hour a day. Slays: Gtr x 3 x 2'51'. Flpppina eight. 2 IM. 25 a ;pa rn t ils. Everything can be constructed and accomplished by means of Tho "Elertree' rodophnne ai described. coopere $ 1.50 this 011111(, two hands, and it screw- drh'er. The outfit contains 114 separate pieces of material and 24 pieces of finished "The Llrest Catalog In America" articles ready to use at once. Our Ilg. new elrttrlcal evelnpc,ii a No. 19 I, nailing for you. l'iwit ltely finished following are Included: Chromic sa os the moo complete Wireless and electrical Cal alet in print attar. 22a Btu Among the material the parts 'tilo 500 socket, wire (two different lengths/.