Radio Digest (July 1924-Apr 1925)

RADIO DICES T— Illustrated December 6, 191 HOW TO BUILD A SET GIVEN BY JOE COOK NEW YORK. — All folks not knowing how to build a Radio set received the most specific 'and technical treatise ever attempted by any mortal, when Joe Cook, famous actor, related his story recently from in WHX in this city. Everyone Who was sufficiently heavily insured, and didn't care how hearty they laughed, tuned in to hear the description. It was told as only Joe Cook can tell it. LISTEN TO ELECTRONS (Continued from page 1) still far too small to be seen by the world's most powerful microscope, have also been heard just recently by General Electric company scientists. The roar of iron atoms as they are attracted by a magnet is plainly heard by the use of a special device used in connection again with a vacuum tube amplifier and a Radio loud speaker. The special device carries out the idea of a German scientist, Dr. H. Barkhausen of Dresden. A piece of soft iron is inserted iin a coil of 17,000 turns of wire which is connected to the amplifying system. As the soft iron atoms twist about to agree with the polarity of a magnet brought close, the roaring sound is produced in the loud speaker or head phones attached to the amplifying system. Noise Parallels Number of Electrons Returning to the research on the sound of electrons, carried on by Dr. Hull and Dr. Williams, it is interesting to know that the noise is proportional to the number of electrons which fly across from filament to plate each second. The purpose of the electron sound investigation was to determine in a new way the quantity of electricity carried by an electron. This has been done previously by Professor of Physics Millikan of the University of Chicago using what is known as the oil-drop method. By the procedure used by Doctors Hull and Williams it is possible to obtain values of high accuracy, thus getting an independent check on Millikan's determination. The measurements thus far made by this method give a value for the charge of the electrons within one-half of one per cent of that obtained by Millikan. Though as yet less accurate than the results of the experiments of Millikan, these measurements are capable of refinement which may equal or exceed in accuracy the oil-drop method. Electron's Debut Only Recent Not long ago the electron was unknown. First scientists had the molecule, itself so small that man has not yet seen it. Then came the atom, the minute integral part of the molecule. For a long time the atom was considered as the smallest particle of matter. But each element presents a different atom. Science was not content to rest. It sought to connect all phenomena, and the electron was the result. Scientists now believe that all matter is composed of electrons and that different substances result from the different properties possessed by the atoms according to the number and arrangement of the electrons they contain. WHERE WEIRD TALES ARE TOLD A camp Are scene in the Adirondack mountains — old pals — and the Radio set. Modern jazz mixed into hunting tales amid the charm of the camp fire. .A sheet! of tin makes a very good loud speaker horn in the open spaces. Receivers for Blind NEW YORK. — The American Radio association, headquarters here, has started a campaign to raise funds to equip with Radio all homes where blind persons dwell. To this end contributions toward the fund are asked through local newspapers or directly to the American Foundation for the Blind, 41 Union Square, New York city. Old sets, and spare parts are not desired, as it is believed best to purchase new equipment, which will be done with the approval of an advisory committee on which government Radio experts will be represented. Radio "Eiffel Tower" for Berlin LONDON. — A Radio message just received from Berlin says that work has started in that city on the construction of an "Eiffel Tower" for Radio transmission work. The tower will be over 430 feet high. It will contain a restaurant 155 feet above the ground, while 15 feet from the top there will be an observation platform accessible by an elevator. CONTENTS Radio Digest, Illustrated, Volume XI, Number 9, published Chicago, Illinois, December 6, 1924. Published weekly by Radio Digest Publishing Company, 510 N. Dearborn Street, Chicago,. Illinois. Subscription rates, yearly. Five Dollars; Foreign Postage One Dollar additional; single copies Ten Cents. Entered as second-class matter at the post-office at Chicago, Illinois, under the Act of March 3, 1879. All the Live News of Radio 1 to 8 Keep Growing Wiser — Order of Hoot Owls 5 An Eight Dollar Crystal Set with Selectivity, Fart II — Panel Layout and List of Parts 9 An Evening at Home with the Listener In, a chart showing when to listen in for your favorite station 10 Advance Programs for the Week at*the Larger Stations 11 to 14 "Low Loss," What It Is and Why, by Jacques Pournier 15 Editorial; Indi-Gest; Condensed by Dielectric 16 How to Build the Simplest Possible Super-Het, Fart IV — Answers to Some Questions Asked, by John G. Ryan 17 Helpful Hints to Get the Most from Radio, Chapter XII — Telephones and Loud Speakers, by Thomas W. Benson 19 Selective Hook-Up for Long Distance, by Winston Kock 21 Questions and Answers 22 Radiophone Broadcasting Stations, Part III 23 CHICAGO SHOW CLOSES (Continued from page 1) the Radio fund for the blind, was auctioned off to the public on the closing night. William Hale Thompson, former mayor of Chicago, started the auction, knocking down a R. C. A. super-heterodyne receiver for J150. Attendance Greatest Ever One of the touching donations to the fund was that of $27.50 by employees of the Coliseum. During the week more than $G00 was collected at various booths and through the crowd by flower girls selling roses. The total attendance for the week was !:::•, 002, against 125,000 at the New York show. Each night various broadcasting start ndered part of their program from studio in tin: Coliseum. A special prou was broadcast on 80 meters by Station 9XBG, owned by E. T. Flewelling, prominent Radio engineer. An orchestra composed entirely of blind musicians gave their services. This was the first time that a blind orchestra has played for a station broadcasting on such a low wave 1 ngth. Exhibitors Pleased with Show Eastern manufacturers who came to Chicago to exhibit this year for the first . expressed their surprise and widespread interest at the scale of the show, admitting it to be far greater than the one held in New York. On Wednesday, November 1ft, the attendance was the greatest that had ever • pres'-nt at a Radio show. Man: the exposition stating that 28,399 were ted as paying admission on that day. show closed with the singing of Star Spangled Banner" by Miss Edith nett, followed by "Auld Lang Syne." Looking Ahead Experimenters — Plenty of Food for Experiment will be given you beginning next issue, when Prof. J. E. Owen, chief of the bureau of standards at the University of Oklahoma, begins his series of articles telling you how to use the odds and ends about the house to demonstrate to your own satisfaction what really makes the Radio "go." Don't miss the start of this ! Jacques Fournier's Interesting Treatise on "Low Loss" will be continued next issue, taking more variable condensers into consideration. He will criticize the Hammarlund, Continental, Garod, Premier and Lincoln makes. Watch for the description of the low loss set soon to come. Tuning Principles in General will be the next and final subject to be discussed by Thomas W. Benson. This clearly understood writer will terminate his series next issue. The last article will be just as valuable as its predecessors. "How to Operate" Will Describe a New Receiver next week. The set to be illustrated hasn't been on the market so very long, but has proven itself worthy of an article on how to install and operate it. Winding Low Loss Inductances? See the anti-capacity cage coil support designed and used by Arthur L. Kaser. Real selective and efficient inductances can be wound using this form to be described next issue by Mr. Kaser. Newsstands Don't Always Have One Left WHEN YOU WANT Radio Digest YOU WANT IT! BE SURE OF YOUR WEEKLY COPY BY SUBSCRIBING NOW SEND IN THE BLANK TODAY Publisher Radio Digest, 510 N. Dearborn St., Chicago, lllnoii. Please And enclosed check M. 0. far Five Dollars (Six. Foreign) for One Year's Subscription to Radio Digest, Illustrated. Name _ _., Address City State Trade Stark The Ford of Loud Speakers Fultone has been thoroughly tested on regenerative, reflex, tuned radio frequency and super-heterodyne receivers and has proven its ability to handle both faint programs from distant stations and the roaring volume of the locals. This it does without distortion, without blasting and with a pleasing absence of tinny or other metallic noises. If your dealer cannot supply you, send money order or check for $9.50 HALL & WELtS, Inc. 128 N. Wells St. Chicago, 111. Think of the boundless delight of that dear old mother, confined to the house by the rigors of winter or the infirmities of age, when she listens in for the first time on a Crosley Radio. Imagine the joy of the kiddies, when they awaken you Christmas morning with the glad tidings that "Santa has brought us a Crosley Radio." Then decide to make this a Crosley Christmas. There can be no gift with greater possibilities for continued happiness than a Crosley set. It carries Christmas along through the year, continually giving new thrills and happiness, and bringing pleasant thoughts of the giver. It is a delight to operate a Crosley. The immediate response to the turn of the dials; the clearness of reception from far distant points; the real ease with which local stations may be tuned out; all help to make Crosley reception distinctive and exceptionally pleasurable. The very low cost at which _ this really remarkable radio performance can be obtained places Crosley sets within the reach of all — the ideal Christmas gift. BEFORE YOV BUY— COMPARE YOUR CHOICE WILL BE A CROSLEY Crosley Regenerative Receivers are licensed under Armstrong U. S. Patent No. 1,113,149. Prices West of the Rockies, add 10% Crosley Model 52, Price $30.00 With three tubes and Crosley Head Phones, $45.75 For sale by good dealers everywhere The Crosley Radio Corporation POWEL CROSLEY, JR., PRES. 12491 Sassafras St. Cincinnati Crosley owns and operates Broadcasting Station WLW