124 



THE WORLD'S ADVANCE for JULY 



GET OUR EDITION CATALOG No. D40 



$17.95 



No. 8999. Receive 

 up to 2500 miles, 

 send up to 20 

 miles. 



Illustrating the most complete line of Wireless 

 Sets, Tuners, Helices, Condensers, Spark Gaps, 

 Leyden Jars, Head Bands, Anchor Gaps, An- 

 tenna Switches, Spark Coils, Variable Conden- 

 sers, Potentiometers, 100 Electrical Books and 

 General Electrical Apparatus. 



AT FACTORY PRICES 



Send 6c in stamps for postage. 



NICHOLS ELECTRIC CO. 



1 and 3 WEST 

 BROADWAY 



The house of remarkable values. 



nU^b 



$1.60 



Nichols Detector 

 with Buzzer Attach- 

 ment No. 3258. 



NEW YORK CITY 



CRYSTALOI 



The New Wireless Detector 



A Permanent Wireless Detector That 

 Has Made a Wonderful Record 



WE HAVE SENT CRYSTALOI DETECTORS TO 

 EVERY COUNTRY IN THE WORLD. THEREFORE 

 IT NOW HAS AN INTERNATIONAL REPUTATION 



IT WILL NOT BTTBN OUT OB GO DEAD and will last 

 indefinitely. All elements are sealed in the little cylinder 

 which is revolved to secure finest adjustment. The "Crys- 

 taloi" is positively the most sensitive and thoroughly 

 practical detector ever designed. It is not a make-shift. 

 It is a precision instrument in every sense of the word 

 and is beautifully finished. 



EACH "CRYSTALOI" is tested for extreme long distance 

 at our station, which insures the one you get being abso- 

 lutely perfect or money refunded. 

 WHITE TO-DAY for full information. 



Type 013.50 Type AA $6.00 



EUGENE T. TURNEY CO. 



2595 Third Ave., NEW YORK CITY 



The Albany ? a 3, e Condenser 



.003 Mfd. Capacity 31 Plates 



Price $3.25 Postpaid 

 Send for circulars. 



MAGUIRE & SHOTTEN 



814 Lancaster St. Albany 



BOYS Save You Money BOYS 



Set up that wireless set or get those electric novelties you 

 have been wanting 



NOW 



Material savings on Wireless and Electric Goods of all kinds. 

 Send stamp for catalogue and sample of Burning Wire. 



TOMLIN BROS., Evansvllle, Wls. 



Save$3.00 



"This high-grade Receiving Transform- 

 er is the biggest value ever offered for 

 only $5.00. W. A, Simmons, Berk- 

 shire, N. Y." The price of this instrument will be $8.00 

 after July 15. Order one now. 



Send two cent stamp for bulletin 104. 



COLBY'S TELEGRAPH SCHOOL, Auburn, N. Y. 



SPECIAL LONG WAVE TUNERS 



For Receiving 

 the New 



High Power 

 Stations 



TYPE K-4 

 Wave length range 1000-8000 meters 



TYPE G-3 



Special Designs Wave lflth range 1000-17000 meters 

 rd . Finished in polished dark mahogany, 



Dlished nickel 



Finished in poished dark mahogany, polished hard ' . ~ Finished in polished dark mahogany, polls] 



PDirPtl iflft rubber and nickel, with silk * order. and polished hard rubber DDIfC Cfl 

 PRILL, $15.00 covered inductances. casing. flUCE,, $DU.UU 



These tuners used in conjunction with the various recent Audion and Audion amplifier circuits, represent the latest development 

 in Radio receiving apparatus. Other types for various wave lengths. 



STUDENTS SUPPLY COMPANY Meigs Bldg. BRIDGEPORT, CONN. 



For our Mutual Advantage mention ine world* Advance wnen writing to Advertisers. 



