V4nsouncing- - World Radio History

AP1tIL 1926

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RCA

Loudspeaker

MODEL

100

Get the boom of bass notes. Get the clear sweetness of high overtones Give your

set rare tone quality with this RCA Loudspeaker. It is particularly adapted to sets that use the new power Radiotrons.

Radio Corporation of America

New York Chicago San Francisco

RCA Loudspeaker i

MA D E

BY THE

MA K ERS

O E

RA DI O L A S

ITT

The Best in Radio Equipment

1

The staff of Brandes

experts, with their background of experience in acoustics since 1908,welcomes the opportunity of

collaborst.ng with

the technical staffs of set manufacturers.

The Perfected Cone

Beautiful, TOo

Anyone can claim "perfection" but in this case the verdict of superquality is bestowed upon the new Brandes Cone by a highly critical - audience of distributors, dealers and public. Any comparison is instant proof that it takes experts like Brandes to achieve both satisfyi?g- reptoductidn and a beautiful cabinet. The ever increasing demand for the Brandes Cone is the final indication of its perfection.

means the ultimate in reproduction

All apparatus advertised in this magazine has been tested and approved by POPULAR RADIO LABORATORY

POPULAR RADIO

EDITED by KENDALL BANNING

FOUNDED tptt

CONTENTS for APRIL, 1926

VOLUME IX

(Cover design by Frank B. Masters)

The Fastest Projectiles on Earth

1,000,000 Miles a Minute

E E. Free

How to Get an Operator's "Ticket"

Howard S. Pyle

What a Straight -line Frequency Condenser

Really Is

:

Herbert J. Harries

"S. O. S."

How to Build the Power -pack Amplifier

Albert G. Craig

A Radio Patrol of the Seas

The New "Crystal Pilot"

Thomas L. Bayard

How to Build and Operate a Low -power Trans-

mitter

Gordon Fraser

Helpful Hints for Operating the LC -26 Receiver . S. Gordon Taylor

Two Unique Features of a New Station

The Popular Radio Medal for Conspicuous

S?rviee

NUMBER 4 Frontispiece

Page 303

311

318 330 332 341 342

348 356 362

363

DEPARTMENTS

In the World's Laboratories What Readers Ask

E E. Free

366

Hugh S. Knowles

374

The Broadcast Listener

Raymond Frances Yates..

378

Listening In What's New in Radio Apparatus In the Experimenter's Laboratory With the Inventors

Lloyd Jacquet

382

The Technical Staff

386

Laurence M. Cockaday.. .

389

... William G. H. Finch . ,395

VOLUME IX

APRIL, 1926

Nuxase 4

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Printed in U. S. A.

E.

E,

FREE,

Ph.D.,

LAURENCE M. Contr'buting-Editoi

COC?ADAY. Technical Editor JOHN V. L. GAN,

Co?lributing

Editor

For advertising roter address

New _1[ork:

E. R..CROWE.& COMPANY, INC.

25- Vanderbilt Avenue

Chicago:, 225. North' Michigan ,.Avenue..,,

. .

2

The Best in Radio Equipment

It is written:

"To see oneself is So

be clear- sighted."

The clear- sighted

see past the beautiful exterior of the Synchrophase to the true virtue within.

For Those Who Understand and Appreciate Quality

-in Reception -in Construction

Exclusive Grebe Developments:

Flexible Un c

Binerelar Cous

Pus. U. s. e.. Off . and

Lawave

Extension

Cirrv;u

THE appearance of the inside of radio receivers reveals little or nothing to the uninitiated. But men who are

"radio- wise" see a vast difference in set construction. By the former the ear only can be used in judgment; to the latter, the eye tells almost as much as the ear. Look inside a Grebe Synchrophase. Your eye will be as delighted with the quality of construction as the ear will be satisfied with the superior receptivity, which this construction not only makes possible but maintains.

Ask your dealer to demonstrate.

A. H. Grebe SI. Co., Inc., 109 West 57th Street, New York

Factory: Richmond Hill, N. Y.

Western Branch: 443 So. San Pedro St., Los Angeles, Cal.

This compannowns and oper-

ates 00:1

also

W? v.vav<

d

-

broadcasting stations, anmd marine

RMU.

Ask how and why they make Grebe reception so

superior and dependable.

4BE 1111D

All Grebe apparatus teetered by patents panted and pending.

All apparatus advertised in this magazine has been tested and approved by POPULAR RADIO LABORATORY

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