Volume 151, Issue 3
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Features
Plastic Model of Ancient Rome
Diving in Coral Gardens
A Scientist Works Beneath the Clear Waters of the Coral Reefs of the Bahamas
600 Wheels an Hour
An Efficient Set-Up of Special Machinery and Gravity Conveyors Makes It Possible to Turn Out Motor-Car Wire Wheels at this Speed
The Sterilization Law in Germany
Excavations at Ur
Beach Blasting
Stars on Parallel Tracks
Building the World's Largest Aqueduct
How it is built
Color Filters
Provide the Advanced Amateur Photographer With a Fertile Field for Experimenting
Sundials and their Construction--VI
Lines of Declination; Signs of the Zodiac
Why the Battleship?
Concluding Article of a Two-Part Discussion on the Battleship as a Necessary Naval Unit
Telescope Making
New Hobby Clubs Create Constantly Spreading Interest in