Calendars, Ancient and Modern
Fitting Our Time Unit to Astronomical Constants
Volume 75, Issue 1949supp
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Features
The Cost of Success
Grinding Wheel Sparks
How They Indicate the Character of Steel
The Reconstruction of the Quebec Bridge
A Design Proposed by a Russian Engineer
Metal Fakes
How the Unwary Buyer is Deceived
Measuring the Height of an Aeroplane
The Rainfall and Flood Conditions in Ohio, March 23 to 28, 1913
Special Report Prepared for the Weather Bureau
The Structure of the Atom—VI
The Physical and Chemical Properties of the Atom Explained in the Light of Modern Theory and Experiment
A New Vacuum Gage of Extreme Sensitiveness
The Weight Efficiency of Prime Movers
Rabbits and Cats in Australia
Geographical Charts Prepared by Aerial Photography
Problems in Wireless Telegraphy
The Present Status of the Art, and Outstanding Difficulties