THE WORLD'S ADVANCE for JULY 



125 



NOW 



is the time to 

 buy "H-C" 



WIRELESS 

 OPERATORS 

 RECEIVERS 



Prices have re- 

 cently been re- 

 duced but the 

 same high 

 quality has been maintained. 



Write for Latest Prices 

 and Booklet 



The Holtzer Cabot Elec. Co. 



BROOKLINE, MASS. 



Western Office, 6161 So. State St., Chicago, III. 



Winger's 

 Closed Core 

 Transformers 



14,000 VOLTS 



'/ 4 K.W. 



'/ 2 K.W. 



3/4 K.W. 



I K.W. 



$10.75 

 15.90 

 20.50 

 25.50 



Designed for 110 volts 60 cycles. 

 Send stamp for folders, etc. 



WingerElec. & Mfg. Co. 



Agents-Radio Apparatus Co. of America, Parkway Bldg, Philadelphia, Pa, 



BY dealing with us you can always be sure you will get 

 the first quality, and the prices we Quote are always 

 rock bottom. The following list will only give you an 

 idea of the substantial savings we offer. You should by all 

 means have our complete up-to-date catalogue in your flies. 



Wireless Bargains 



New Silicon Detector. The best yet, complete 



with mineral, each $.85 



100 Amp Switch Clips, each 15 



100 Amp Switch Hinges, each 20 



A new Switch Point for tuners, per doz 35 



Name plates. Aerial, Ground, etc., per set 



of II 1.00 



We will not accept stamps for over lOc. 



Small orders are Just as welcome as large orders and will 

 receive the same prompt, careful and courteous attention 

 at our hands. Shipment made same day order is received. 



Send 2c. Stamp for Catalogue 

 DORON BROS. ELEC. CO., Hamilton, Ohio 



Most Sensitive Set on the Market 



Sent on 10 days' trial. Brings in clearly and readably 

 stations barely audible with your present Set. The 



STROMBERG-CARLSON 



Radio Head Set 



Standard A-9723 has a wonderfully clear soft tone that 

 greatly reduces static interference. Wound to 2000 Ohms. 

 Send draft for $8.25 and try this Set for 10 days. If 

 unsatisfactory, money will be refunded. Write today for 

 free Bulletin No. 1006. 



STROMBERG-CARLSON TELEPHONE MFG. CO. 

 Chicago. Ills. Rochester, N. Y. Toronto, Can. 



Agents: Telephone Electric Equipment Co. 



SAN FRANCISCO. SEATTLE. LOS ANGELES 



JT. H. Bunnell A Co The Wm. B. Duck Co. 



NEW YORK TOLEDO, OHIO 



EXPERIMENTERS NOTICE 



Revised Schedule of Prices 



Buy our regular high grade Enameled and 

 Single Cotton Covered Wire at the fol- 

 lowing prices: 



Cash with order and no order taken for less than 

 $1.00, and no wire put up on less than one pound 

 spools. Add postage. 



Do you need Double Cotton or Silk Covered 

 wire? We make it. Space does not permit listing, 

 write for prices. 



AMERICAN ENAMELED MAGNET WIRE CO. 



MUSKEGON, MICHIGAN 



For our Mutual Advantage mention The World's Advance when writing to Advertisers. 



