Science and Invention, vol. 11, no. 7, November 1923

This issue is composed of the following stories and articles, some of which go unattributed on the table of contents:

Editorial
Electric Finder Salvages $30,000,000 in Gold

Earthquakes and Their Causes
By Edward H. London

How Artificial Pearls Are Made
By Ismar Ginsberg, B.Sc., Chem. Eng.

Parlor Movie Machine Fits on Your Phonograph
Moving Objects on Still Scenes
$12,000 or More in Gold Prizes

Antique Organs
By Charles Beecher Bunnell

Medical Hokum Exposed
By Joseph H. Kraus, Staff Medical Expert

World's Energy from Atomic Force
Weird Deaths from Stray Currents
Automobile Sled—Non-Sinkable Boat
Can You Be a Movie Star?
The Newest Radio Photo-Play

Around the Universe—5th Installment
By Ray Cummings

Dr. Hackensaw's Secrets—No. 23—What Dr. Hackensaw Found on the Moon
By Clement Fezandié

Height Test for Aviators

Sky-Writing—An Exact Art
By W. B. Arvin

Electrically Driven Ferryboat
Camera Used to Judge Horse Races

Hearing through the Teeth
By H. Gernsback

Army Airplane Refuels in Flight

How Rubber Articles Are Made
By Ismar Ginsberg

Sheet Metal Air Propeller
$50.00 Prize Contest—Pyschic Motor

Office Equipment of Ancient Times
By Charles B. Bunnell

Biting Flies That Spread Disease

Compressed Air in Building Construction
By Raymond Wardell

Compressed Air in Subway Operation
By R. H. Tingley

Monster Army Tank Destroyer
By S. D. Rockenbach, Commandant U.S. Army Tank School

Gold-Leaf—How It Is Made
Typewriting by Wire

Popular Astronomy—Star Map for November
By Isabel M. Lewis, M.A., of the U.S. Naval Observatory

Aids to the Motorist

Motor Hints—No. 1—How Carburetors Work
By Tom C. Plumridge, Automotive Expert

Magic for Everybody—No. 8 of a Series
By Prof. Joseph Dunninger

Popular Scientific Errors
By Raymond B. Wailes

Experimental Electro-Chemistry
By Raymond B. Wailes

Experiments with Spar Crystals
By O. Ivan Lee

Hand-Propelled Ice Skiff
Some Interesting Fountains
Home-Made Laboratory Apparatus

How to Make a Short Line Telephone
By T. W. Heine

Perfume Making for Amateurs and How to Restore Dry Batteries

How-To-Make-It Department—$30.00 in Prizes
Wrinkles, Recipes & Formulas—$5.00 Monthly Prize

Radio Operators Learn Code while Asleep
Radio and Loud-Speaker in Boys' Camp

Fight Returns to Argentine by Radio
By H. Winfield Secor

Radiophone on French Trains
By A. N. Mirzaoff

Broadcast Relay on 100 Meters
By Howard Allen Duncan

Good Single Circuit Receiver

Cockaday Four-Circuit Tuner
By Leroy Western

An Experimental Circuit Panel
By R. D. B. Washburne

Handy “Bootleg” Tube Sleuth

Crystal Detectors
By A. P. Peck

Radio for the Beginner—One Wire Aerials
By Armstrong Perry

Radio Oracle
Scientific Humor—Prizes for Best Jokes

Radio Wrinkles
Edited by A. P. Peck