Indianapolis Times, Volume 37, Number 125, Indianapolis, Marion County, 24 September 1925 — Page 18

EARLY MAKERS OF CONDENSERS STARTED WRONG (_ Pioneers Got Away on Bad Track in Many Respects. ty Frank Reiclimann, 15. S., K. M. President of the Reichmann Company We can now begin to see where the pioneers of radio started on the wrong path in a great many things. Take the matter of variable condensers, for example. The early manufacturers labeled their product by the nrniber of plates they contained, and not by the maximum capacity at which they were rated. To classily condensers by the number of plates is just like marking barrels by the number of staves instead of the amount of material they will hold. An eleven plate condenser may have any capacity from zero to infinity, depending on the size of the plates, the thickness of she dielectric, and other factors. Broadcasting stations are placed on cerUiin wavelengths aid even today the position of a static i is given in meters, while actually the stations are placed at equal divisions of frequency. The condensers were accordingly made to tuno by equal changes In wavelength. The frequency difference of two stations on a low wave may be ten kilocycles, yet they both may be located within a band of two meters. If these two stations were located on high waves and separated by ten kilocycles the wavelength of the two might be five or six meters apart. This makes the lower wavelengths appear to be very congested when ordinary variable condensers are used for tuning. Stations on the high waves are just as close together and, in fact, every available frequency band has been occupied

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Device Directs Pilots Along Correct Route

Itii XEA Service DAYTON, Sept. 24.—Air mail pilots need not worry about getting off their course with the new radio direction finding apparatus developed at McCook field. A beacon tower, which sends out signals to the pilot as he proceeds on his course and keeps him informed as to his position, is being erected at Monmouth field, Illinois. The instrument used for sending out signals from the beacon tower is called a goniometer. It is about four feet in height. When operating it sends out signals—one of characteristic sound that Is heard by the pilot when he Is to the right of his course, another when he Is to the left. A third when he is right on the course. The signals are received by the pilot with the standard military receiving set, and no other equipment Is needed in the plane. Airmail Pile* J. Burnside recently had his plane equipped with the receiving set and was instructed by radio officials here in the use of the new direction finding system. McCook field pilots have been using it for seme time in fights from the field. Some of the fights have covered 200 miles, during which the pilots depended on the radio beacon signals to guide them back on the course.

by one or more stations. This matter is now being corrected by designing condensers that tune by equal variations in frequency, rather than changes of capacity of wavelength. The best new condenser has a straight line frequency calibration curve, that changes the tuning of the circuit in approximately ten kilocycles for each division on the dial.

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THE INDIANAPOLIS TIMES

Radio goniometer for use in directing pilots on air-mail course.

According to Capt. William H. Murphy, head of the radio branch at McCook field, under whose direction the goniometer was developed, it will be necessary for the airmail service to have such beacons every 200 miles or so. The one being Installed at Monmouth will be the initial trial bea con.

Stations are spread over the dial equally, with stations on the lower end of the dial separated and the high wavelength stations crowded together a great deal more than on ordinary condenser dials. This makes tuning easier and eliminates the need for hair line tuning devices and vernier controls and helps to clear up the apparent congestion on the lower wavelengths.

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ATTENDANCE AT SHOW GROWING (Continued From Page 1) couldn’t forget the forks, or the cups, or even the salt. Then the gruphophoi e became the rage, and by degrees worked itself up into such a frenzy that it blossomed into a phonograph and finally out on the market in portable form. Now along comes the radiola, the perfect radio receiving set that's just like a suitcase —if you’re used to having a lot in it. And the automobile begins to bulge on every side j with paraphernalia. Combinat ion Portable Moreover, the inventors have combined with great success the portable radio with the portable phonograph in one handsome, heavy, but portable case. Now there is no excuse for father objecting to jaunts because he wants to listen to the stock market returns at home, or mother demurring because she wants to hear Whozis sing from Pittsburgh, though there’d probably be some discussion as to who gets what —but the young folks could play the phonograph while the old folks were deciding. A deal was consummated today between the Federal Automobile Insurance Association, represented by Glenn E. Harsh, president, and J. F. Connell, secretary treasurer of the Kruse-Con nell Company, whereby one thousand radio sets, complete in every detail and ranging in price from popular models up to the finest cabinet sets, will be supplied to the insurance company l’or their many agencies. Harsh, in commenting on the

Wilson-Stewart Music Cos. At the Show Booths 61 and 62 Displaying Atwater-Kent Receiving Sets Priced at SBO Beautiful Period Cabinet Sets as Low as $225 (Less Accessories) Radiolas Products of the Radio Corporation of America, the world’s largest radio manufacturers. All Prices—sls Up to the Famous Super-Heterodyne (Less Accessories) 1 1 Delivered Complete, Ready to Operate, Our Price $159.50. Sonora This New Receiver, made by the world's famous manufacturer of musical instruments and Loud Speakers, has proven . itself a leader. SF.E THIS DISPLAY WITHOUT FAIL ANY RADIO SET SOLD ON THESE Terms 1(1% a Month I Not Including Any Accessories Wilson-Stewart Music Cos. N Successors to k 44 N. Penn. St.

transaction, said: “I did not realize what a potent factor the radio industry has become in modern life until the Indianapolis Radio Exposition end the attendant publicity became apparent. I feel tiiat racfl| is the most important single instinN lien in the Nation today and that c#ur company could not afford not to make t possible for each of our agents, of which there are well over one thousand operating In eleven Slates, to become the owner of a set of some kind. We will offer these instruments to them on a premium basis, and expect to obtain wonderful results from the plan.” This is believed by the management of the exposition to be the largest single order for sets placed so far. COMPANY HAS NEW LINE The Kurz Kasch Company, Dayten. Ohio,'- has brought out a complete line of dials and knobs, and has added to the line potentiometers, rbeostabs and sockets. A short time aigo this company took over the manufacturing and selling of The 11-Z-Toon, and are now manufacturing the Kurz-ICaseh Aristocrat E-Z-Toon. This company manufactures Its own molds. The factories are looted at Dayton and sales are handled through the Hartzell Sales Company, New York City.

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