Volume 128, Issue 1
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Features
Motion Pictures in Three Dimensions
Our Psychic Investigation
Its Scope, Conditions and Procedure, as Far as They Can Be Laid Down
Inventor vs. Forger--II
The Present Status of the War Between the Check Raiser and the Check Protector
The President's Plea for a Merchant Marine
Rapid Transit on a Moving Belt
Fuel by the Ton or the Gallon?
The Principal Advantages and Disadvantages of the Oil-Burning Furnace for Domestic Use
Two Bridges in One--Chicago's Michigan Avenue Bridge
The Sense of Smell in Birds
Doing Two Things at Once
Multiple Consciousness, or Reflex Action of Unaccustomed Range?
An All-Steel Grandstand, Death from snake-Bites and more
Pictures that Talk
Combining Sound Records with Motion Pictures to Obtain Talking Pictures
Panama Canal Tolls
Revenue Loss of 8,000,000 Through Lack of a Proper Statutory Definition of Net Tonnage
Novel Means of Testing Levers
Research and Spectacles
The Lensometer, for Measuring the True Power of Ophthalmic Lenses
The Fight to Conquer Old Age
The Rejuvenation Theory and the Results Achieved from it by Steinach
Apparent Death and Resuscitation
A Discussion of Causes, Symptoms, and Methods of First Aid
Our Aladdin's Lamp
Recent Developments in Vacuum Tubes of Giant Size for Radio and Power Transmission
A Gear With Only One Tooth, Escape from the Garbage Can and more
Leaves from the Archaeologist's Note-Book
What Pick and Shovel Have Revealed of Early Civilizations in Crete and Other Places
Summer Foods in the Winter Time, The Ascent of Sap in Trees
The New Conservation--II
Simplified Practice, and What It Means to Manufacturer and User
On the Trail of the Taxi Driver, The Flickerless Projector
Making the Mississippi Rebuild its Banks
Ingenious Method of Reclaiming Eroded Land by a Mat of Trees
When Alaska Forest Rangers Travel by Motor Boat, The Life-Cycles of Bacteria and more
Airplanes in the Public Consciousness
The Planes-in-the-War Exhibit at the National Museum in Washington
A New Principle in Plowing and Road Surfacing and Ice Surfacing, Soil Acidity Preferences of Some Eastern Conifers
Between Two Worlds
A Garden Telescope for the Amateur Astronomer, The Pocket Barometer-Altimeter and more
The Story of Gas
The Various Steps that Lie Between the Raw Coal and the Domestic Burner Compiled by the Scientific American from at a furnished by the Smithsonian Institution
A Practical Contact Attachment, New Neon Lamps
Bridge Construction With Floating Steel Centers
Substitution of Movable Hinged Steel Centers for Cumbersome and Costly Wood Centers
Sideways Launching Made Safer and Surer, Centrifugal Car-wheels with Manganese-Steel Rims and more
A Builder's Paradise
Ground that Cuts Like Cheese and Needs No Shoring or Piling
Removing Spots from Leather by Means of Rubber
Tricks of Over-Exposure, New Method for Revising Copper Map Plates
Building a Railroad in the Frozen North
Alaska Linked Up with the World by 500 Miles of First-class Railroad