Volume 72, Issue 1857supp
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Features
Measurinǵ the Laborer's Worth
The Application of Laboratory Methods to, the Study of Labor Questions
The Equation of Time
How Clock-Time is Related to True Solar Time
Cement and the Colloidal theory
Blaringhem on his New Species
Transportinǵ Live Fish
The Question of the Combination Projectile
The Ideal of Field Artillery
Rules Governing the Competition for the $15,000 Flying Machine Prize offered by Mr. Edwin Gould
Photoǵraphy an Aid to astronomy
Where the Photographic Plate Excels the Eye
Unmaǵnetizable Steel
Fish Life
Novel Portable Gasoline Motor-driven Air Compressor
Suitable for Inflating Pneumatic Tires
Radiometer Motion Stopped by a very High Vacuum
Four-Cylinder Compound German Freiǵht Locomotive
A Fine Example of German Construction
Magnets for Handling Carǵo
The Animal Machine
The New Respiration Calorimeter of the Berlin Agricultural High School
Practical Application of Meteoroloǵy to Aeronautic5-II
What the Meteorologist Can Do for Flying and Airshipping
A Drinkinǵ Cane
Radioactivity of Snow
A Hiǵh Frequency Meter
A Grain Tester for Commercial Use
A Moisture Tester for Grain and Other Substances and How to use it
The Stick Insect
Practical Aspects of Printinǵ Teleǵraphy—II
An Inventor on the Difficulties to be Encountered and the Way to Overcome Them