THE WORLD'S ADVANCE for JULY 



123 



BRANDES 



"NAVY TYPE" 



WIRELESS RECEIVERS 



The "Navy Type" is just the headset for 

 the man who wants the BEST. Not only 

 best in sensitivity, but the lightest and 

 handsomest pair of receivers on the mar- 

 ket. 



Send stamp for new catalogue "R." It con- 

 tains full specifications of all our headsets. 



Price, complete $13 



C. BRANDES, Inc. Wireless Receiver Specialists 

 32 Union Square, NEW YORK 



fSan Francisco : Ford King, 520 Market Street. 



Los Angeles : Southern California Elec. Co., 625 South Main Street. 

 Ar.FNTS -4 Central States: William. B. Duck Co., 224 Superior Street, Toledo, Ohio. 



Chicago : Winger Elec. & Mfg. Co.. 711 South Dearborn Street. 

 L Australia: G. C. Hamilton, Ltd., 177 Elizabeth Street, Sydney, N. S. W. 



NEW BULLETIN 



JUST OFF THE PRESS 



Tells you more about the wonderful audion 

 detectors, amplifiers, variometers, and many 

 other good things. 



The fellow with the long distance record 

 uses an audion and there is no reason 

 why you, too, cannot copy long distance 



f ""USE THE AUDION 



Used with an amplifier, you can get dis- 

 tances you never dreamed of. 



Better send us a one cent stamp 



and get wise. Do it now. 



THE WIRELESS MFG. CO., Canton, O. 



MOTOR BOAT Si A 

 Wireless Set 14 



Equipped with 2000 ohm 



headset $17.95 



Receives 2000 Miles. 

 Sends 15 to 30 Miles. 

 This station is com- 

 plete in every way. It 

 consists of a full 1% 

 inch spark coil: 12 

 flat plate condenser ; 

 our "D o n't Jar 

 Out" detector, buz- 

 zer and switch. 

 Double slide silk 

 wire wound tuner of 

 long wave station 

 capacity, fixed con- 

 denser, helix, key DTDP switch. 



SPECIAL-- For the Summer. 10% Discount on all our sett. 



Send 2 cent stamp for Bulletin "G." 

 THE RUTHTON ELEC. CO., 35 Frankfort St. New York. 



SEND FOR A COPY off OUR NEW MANUAL-No. 4 



Its pages give simple formulas for calculating the natural period of an antenna; capacity of a receiving 

 or transmitting condenser; spark frequency of rotary spark gaps; tables for calculating the correct amount of 

 wire for the construction of magnets and tuning coils; tables for ascertaining the spark lengths of different 

 voltages; the Federal regulations regarding the restrictions of wave lengths for amateur stations: instructions 

 for the installation, maintenance and operation of wireless stations; directions for learning the code, workable 

 diagrams and a complete list of up-to-date wireless instruments and accessories, together with other features of 

 interest to the amateur or professional wireless enthusiast. 



Containing as it does a fund of valuable information not generally contained in a catalogue, it approaches 



nearer a text book in the fascinating field of wireless telegraphy. 



It is printed on good stock paper with a heavy paper cover in two colors. No expense has been spared to 



make it accurate and reliable. We make a charge of 10 cents for It, which amount will be allowed on an 



order amounting to $1.00 or more. 



No wireless experimenter should be without the MESCO WIRELESS MANUAL. 



SEND FOR OUR POCKET CATALOG No. A28 



It will contain over 200 pages, with over 1,000 illustrations, describing in plain, clear language all about 

 Bells. Push Buttons, Batteries, Telephone and Telegraph Material, Electric Toys. Burglar and Fke Alarm 

 Contrivances, Electric Call Bells, Electric Alarm Clocks, Medical Batteries, Motor Boat Homs, Elec- 

 trically Heated Apparatus, Battery Gauges, Wireless Telegraph Instruments, Ignition Supplies, etc. 

 It means Money Saved to You to Have Our Manual and Our Catalog When You Want to Buy. 



NEW YORK MANHATTAN ELECTRICAL SUPPLY COMPANY SAN FRANCISCO 



17 Park Place CHICAGO, 114 So. 5th Av*. ST. LOUIS, 1106 Pine St. 604 Mission St. 



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



