Volume 150, Issue 4
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Features
British Motor-Lifeboats Are Highly Successful
Insect Warriors Battle For The Movies
Tribulations Of The Tropical Astronomer
Working and Thinking and Eating
Modern Architecture in Germany
Why The New Naval Building Program Is Necessary
The Amateur And His Microscope—X Mounting Specimens
How Not To Swim Faster
Business Flies At Higher Speeds
Refrigerator To Cool Boulder Dam Concrete
Sundials And Their Construction—III
The Construction of North, East, and West-Facing Dials, and Polar Dials