Recent Discoveries in Physical Science—I
Chemical Affinity Interpreted as an Electric Phenomenon
Features
The Hat-pin Menace
Table of Feet Reduced to Decimals of a Mile
Machine Tools and the Motor Car Industry
Several Interesting Machines Used in the Manufacture of Automobiles
Evolution of the Breech-Loader
The Origin of Fire Arms Dates Back to Remote Antiquity
The Decline of the American Navy
How the United States are Falling Behind Other Powers
Desirable Developments in Ship Dimensions
Joints in Materials for Aircraft
The Annual Aero Show in London—I
The Present Status of the Art as Illustrated by the Olympia Exhibits
The Olympia Aero Show at a Glance
The Present Status of the Art as Illustrated by the Olympia Exhibits
The Electric Emissivity of Matter
Physical Investigations and Practical Applications
Snapshot Photography
The Art of Working the Shutter at the Psychological Moment
Blood Pigment and Chlorophyll
Their Close Relation Points to a Common Origin of Animal and Plant Life
The Loaf of Bread
Colossal Waste Due to Bad Municipal Engineering
Paying for Space Economy with Human Life
