Judge — June 24, 1922 — page 26: what you’re looking at

Machine-transcribed from the original scan — historical spelling and the odd misread are preserved.

Real | Vermouth— as made by us dur- ing win pu moved bottle for use in this country, French or It Ils you how! Send your free copy. asy to Play Easy to Pay True-Tone Saxophone Tella whento Easiest of all wind instruments (F ‘0 play and oneof the most beau- titul.” You can les > in ani hour's. prac popular mosie in ou can take your place in band within 90 days, if you so desire. Unrivalled "for home entertainment, church, lodge or fr. NY shoal. in big demand fot o or chestra dance music. The > ls it above is of Donald Clark, tr You may order any Free Trial 532.2027 cniet without paying one cent in advunces aid it bin dayea, your own home, without soli ed, pay for it on easy payments Mention the instrument interested God's complete cntalog will be alied free QUESCHER BAND INSTRUMENT CO. Manors of Evecyising tn Band ana Orevent on Gallon of Gasoline Wonderful new carburetor. Guaran- teed to reduce gasoline bila from one-half ‘to onesthird and increase Bower, of motors from 30 to 50%:, tart easy In coldest weather. Sent on 30 DAYS’ TRIAL Fits any car. Attach yourself. Fords make as high as 34 miles to gallon. Other cars show proportionatesaving. Send make of car and take advan- tage of our special 30-day trial offer. Agents Wanted. AIR FRICTION CARBURETOR CO, 3368 Madison Street Dayton, Ohio STEAMER TRUNK $3.25 i TES STORES boys HEE dabaos Se ‘AMlanta, Georgia 6 Radio Department ConpucTeD By WILLIAM H. Easton, Ph. D. Subseribers to Jepae are invited to turn to us for adrice regarding the select E ration and care of radio reeci ts, No charge is made for e all Letters t tor, Bop West d Street, New York, giving full name and exact stre red t age stamp should be inclosed. "bor information id trans ry) mday Keystone How to enjoy a dull dinner The Crystal Detector HAT little mounted piece of mineral on every ‘crystal- detector” receiver is the vital part of the instrument. If we remove it, we can hear nothing in the earphones. All the impulses caught by the aerial are there, but they are beyond the reach of | our senses. It is only after they have been passed through this crystalline fragment that they can be transformed into audible speech and music. The reason we cannot attach our ea phones directly to the aerial and hear the messages is because the currents induced in the aerial by the waves from the broadcasting station are “alter- nating” in character. That is to si they flow first in one direction and then in the other, and repeat these re- versals about a million times a second. The earphones cannot respond to such currents and therefore produce no sounds. What needed is something that will prevent the currents from revers- and this _is precisely what the 5 s. For some unknown rea- son, the electric current can easily pas through certain crystalline substances in ene direction but cannot flow in the reverse direction. This action is like that of a valve in a pipe, which permits the water to flow one way but prevents it from flowing backwards. When, therefore, the crystal is con- nected in ‘cuit with the earphones, it suppresses the reversals and_ allo only “one-way” (or direct) current to pass through. The diaphragms of the phones can readily follow the varia- tions of this kind of current and they thus reproduce the corresponding sounds. Several different natural are suitable for use in receivers. minerals of Bey these, galena, a heavy, dark gray ore of lead that breaks into cubical pieces, is the most popular. A large propor- tion of the crystals, especially tho: used in commercial receivers, are syn- thetic products of the electric furnace, however. uniform in their Crystals are never structure. Some portions of every cry tal have much greater f power than other portions. thing to be done in tuni detector receiver is, therefore, to find a “sensitive spot” on the crystal. This touching first one point on it after another against its contact un- til messages are plainly heard. The crystal is always so mounted to permit this adjustment. The tones heard with crystal detector receivers are remarkably clear, and be- cause of the simplicity of these piv ers, their cost is low. Excellent instru- ments can be purchased for 1 than 5. Their range is, however, v lim- ited as compared with that of vacuum is done by tube receivers. They cannot ordinarily receive radiotelephone messages from stations over 20 miles away, although they have received from much greater distances in exceptioi case: In the immediate neighborhood of a_broad- casting station, however, they are thoroughly satisfactory. U. S. Radiotelephone Broadcasting Stations a partial list of stations t lowing i which _ licen for telephone broadeasti have been issued, as given in the Radio ervice Bulletin, issued by the Bureau of Navigation, Department of Commerce. All stations use 360-meter waves for general broadcasting. Those indicated by asterisk also send out weather forecasts, crop re- comicbooks.com