Science and Invention, vol. 11, no. 4, August 1923

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

Editorial $11,000.00 FOR SPIRIT MANIFESTATIONS MAN-MADE LIGHTNING

UNDERWRITERS' SAFETY TESTS By A. P. Peck

A ONE MAN ORCHESTRA By H. Gernsback

IF ALL THE PEOPLE IN THE UNITED STATES LIVED IN ONE VAST DWELLING By Charles Nevers Holmes

THE MAN FROM ATOM By G. Peyton Wertenbaker

DR. HACKENSAW'S SECRETS—NO. 19—THE SECRET OF THE SUPER TELESCOPE By Clement Fezandié

AROUND THE UNIVERSE—AN ASTRONOMICAL COMEDY By Ray Cummings

ADVANCED CHEMISTRY By Jack G. Huekels

THE ELECTRIC DUEL By H. Gernsback

VANISHING MOVIES By Teddy G. Holman

NON-STOP FLIGHT ACROSS THE CONTINENT

"SPEED" By Harold F. Richards, Ph.D.

PHONOGRAPH EVOLUTION MOVIE SHOWS DAWN OF LIFE

TELESCOPIC MICROSCOPE By Dr. Albert Neuburger

STORING STEAM FOR USE WHEN NEEDED By Ismar Ginsberg, B.Sc. Chem. Eng.

HOW UNCLE SAME "KEEPS TABS" ON FLIERS By S. R. Winters

NEW X-RAY PLATES By Dr. H. Becher

AN UNUSUAL METEORITE

MORE AUTO SPEED WITH LESS POWER By C. A. Oldroyd

NO OIL—ENGINE STOPS NEW ENGINE ANTI-SMALL DEVICE

NEW APPARATUS FOR MICRO-PHOTOGRAPHY By Dr. H. Becher

POPULAR ASTRONOMY—THE SOCIABLE STARS By Isabel M. Lewis, M.A.

MAGIC FOR EVERYBODY By Professor Joseph Dunninger

SCIENTIFIC PARADOXES By Edward M. Weyer, Jr.

PRACTICAL MOTOR HINTS By H. Winfield Secor

EXPERIMENTAL ELECTRO-CHEMISTRY By Raymond B. Wailes

PRACTICAL CHEMICAL EXPERIMENTS By Raymond B. Wailes

HOW-TO-MAKE-IT DEPARTMENT—$30.00 IN PRIZES WRINKLES, RECIPES AND FORMULAS—$5.00 PRIZE MONTHLY

RADIO BROADCASTING PROBLEMS AND THEIR POSSIBLE SOLUTION By C. W. Horn

MY FIRST RADIO SET By Miss Dorothy Benkeser

BROADCASTING STATION'S PHOTOGRAPHS

VACATION TIME RADIO By A. P. Peck

RADION FOR THE BEGINNER—XVIII SWITCHES By Armstrong Perry

A MICROPHONE AMPLIFIER By Bert T. Bonaventure

PRACTICAL NOTES ON REFLEX AMPLIFIER CONSTRUCTION By Robert E. Lacault

A SINGLE RANGE FINDER

SELECTIVE RADIO CALLING By Frederick V. Hunt

HOW A 700-FOOT RADIO TOWER IS BALANCED ON ITS POINT RADIO ORACLE LATEST PATENTS THE ORACLE PATENT ADVICE