Radio Broadcast (May-Oct 1925)

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Radio Broadcast Willis K. Wing Associate Editor Arthur H. Lynch Editor John B. Brennan Technical Editor AUGUST, 1925 Cover - - - - - From a Painting by D. K. Hutchinson The Social Side of Radio - - - - - Frontispiece 450 From Figures to Fame - - - - - - Myra May 451 How to Build a Two-Stage Detector-Amplifier Unit John B. Brennan 458 The Listeners' Point of View ------ Kingsley Welles 469 The Revolution in the Art of Teaching Frederick P. Mayer 477 The March of Radio - - - - - J. H. Morecroft 483 For the Radio Beginner - - - - Zeh Bouck 492 Adding a Bulb to the Beginner's Crystal Set What "Detection" Means and How It Works References in Good Radio Text Books Radio Terms Defined Wavelength or Frequency — Which? ----- J. H. Morecroft 498 As the Broadcaster Sees It---------- Carl Dreher 500 Drawings by Franklyn F. Stratford An Induction Loud Speaker --------- C. W. Hewlett 508 Making a "Super-Het" From Your Neutrodyne or Single-Circuit Set - - - - - - - - A. O'Connor 516 Coils and Condensers -------- By the Laboratory Staff 524 More About Radio Broadcast's Phonograph Receiver Arthur H. Lynch 529 "Now, I Have Found ..." - - - - - - 535 Neutralizing the Roberts Knock-out A Simple and Efficient Form for Winding Your Own Coils R. F. Transformers and High Plate Voltage Helps for Constructors Winding Coils on "Air" A Plate Supply from 1 10 Volts a. c. Rheostats and Verniers Controlled With Horizontal Dials A Lightning Arrester Made from a Spark Plug Hard Rubber Spiderwebs for the Roberts Receiver The Grid - - - 540 Home Made Coils for the Roberts Receiver The Roberts Neutralization Method Applied to the Neutrodyne Placing of Rheostats Precaution in Charging B Batteries Oscillation of the Hanscom "Super' ' on low waves A Transmitter-receiver Circuit Methods of A and B Battery Connection One Method of learning the Code * Copyright. 1925, in the United States, All rights F. N. DOUBLEDAY, President ARTHUR W. PAGE. Vice-President Newfoundland, Great Britain, Canada, and other countries by Doubleday, Page & Co. eserved. TERMS: $4.00 a year; single copies 35 cents. NELSON DOUBLEDAY, Vice-President S. A. EVERITT, Treasurer RUSSELL DOUBLEDAY, Secretary JOHN J. HESSIAN, Ass't. Treasurer Doubleday, Page & Go. MAGAZINES World's Work Country Life Garden Magazine & Home Builder Radio Broadcast Short Stories Educational Review Lb Petit Journal El Eco The Frontier Doubleday, Page & Go. BOOK SHOPS New York: Lord & Taylor Book Shop Pennsylvania Terminal (two shops) 3 8 Wall St. Grand Central Terminal St. Louis: 22 3 North 8th Street 4914 Maryland Avenue Kansas City: 920 Grand Avenue 206 West 4 7th Street Toledo: Lasalle & Koch Cleveland: Higbeb Co. Springfield, Mass., Meekins, Packard & Wheat Doubleday, Page & Co. OFFICES Garden City, New York New York: 120 West 32nd Street Boston : Park Square Building Chicago: Peoples Gas Building Santa Barbara, California London : Wm. Heinemann, Ltd. Toronto: Oxford University Press