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RADIO AGE for July-Augnst, 1927
Everyday Mechanics
Current Science
Established March, 1922
Volume 6
July-August, 1927
Number 6
CONTENTS
FOR July-August ISSUE
Cover Design by A. P. Mehlum
New Modulation Greatest Discovery 3
By F. A. Hill Do You Know What You Are Missing? 4
By Armstrong Perry
Building a Vacuum Tube Voltmeter 7
By K. B. Morcross The Froth Estate 9
By Joseph Balsamo
Spectrum of Radiation 12
By Elmore B. Lyford
Amateur Radio 13
Pickups and Hookups
Low Power Crystal Control Transmitter
(Blueprint) '. 17
By F. A. Hill
Current Science 27
Everyday Mechanics 31
How Bullet-Proof Vests Stop Steel 32
By Charles Lee Bryson
Correct Broadcast Station List 38-40-42-44-46
Classified Advertisements 48
Radio Age is published monthly by RADIO AGE Inc. Member: Audit Bureau of Circulations.
Publication Office, Mount Morris, 111.
404 North Wesley Ave., Address all communications to RADIO AGE, Inc.
Executive, Editorial and Advertising Offices 500 N. Dearborn Street, Chicago, 111.
Frederick A. Smith, Editor F. A. Hill, Associate Editor M. B. Smith, Business Manager
Advertising Manager HARRY A. ACKERBURG
500 N. Dearborn St., Chicago, III.
Eastern Representative HEVEY & DURKEE, 15 West 44th St., New York, N. Y.
Pacific Coast Representative CONGER & MOODY, Sharon Bldg., San Francisco, Calif. CONGER & MOODY, Higgins Bldg., Los Angeles, Calif.
Final Advertising forms close on the 20th of the 2nd month preceding date of issue
Vol. 6 No. 6. Issued monthly. Subscription price $2.50 a year. July
1927. Entered as second-class matter at post office at Mount Morris,
Illinois, under the Act of March 3, 1879.
Copyright, 1927, by RADIO AGE, Inc.
Chats
One outstanding achievement is recorded this month in the lead article describing the new method of frequency modulation which is expected to be a great boon to the transmission, reception and manufacturinginterests of the radio industry.
Another achievement, though secondary in importance, is the announcement of the a.c. filament tubes, one suited for the r.f. and a.f. stages, and the other only for the detector stage. Full data on these is recorded in this issue.
Amateurs will find two articles covering their activities. The first is by Armstrong Perry and shows what you are missing if you don't pound brass (telegraph). The other is a description of the short wave crystal controlled transmitter at 9BHX. In addition there is the Amateur Radio department.
Fiction lovers will revel in the Springy passages to be found in Joseph Balsamo's present instalment of "The Froth Estate."
K. B. Morcross has contributed an excellent article on the construction of the vacuum tube voltmeter for the serious-minded experimenter.
Both of our non-radio features, Current Science and Everyday Mechanics, are taking up a bit more space than usual due to the interest shown by our readers covering those two features. We shall be glad to hear from others on the subject.
Perhaps you've wondered why a bullet proof vest stops a veritable rain of bullets from a machine gun. Charles Lee Bryson gives an interesting account of the modus operandi.
We announce with regret the departure of our Associate Editor, F. A. Hill, who leaves us to join the Bremer-Tully Mfg. Co., of Chicago, as Assistant to the President.
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Editor of RADIO AGE.