Volume 50, Issue 20
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Features
Elevated City Railways Cause Eye Troubles
Car Truck
Improved Wrench
A New Lock
Collecting and Removing Waste from Spinning Machines
A Photographic Revolver for Amateurs
Bench Plane
American Industries.--No. 89
Tombstone
Ericsson's Sun Motor
A Beautiful House Plant
Dr. Le Plongeon's Latest and Most Important Discoveries among the Ruined Cities of Yucatan
(continued from page 294)