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Scientific American Magazine Vol 67 Issue 7

Scientific American Magazine

Volume 67, Issue 7

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Features

Christopher Columbus

The Approaching Expiration of the Bell Telephone Patent

An Improved Hanger

Hamilton's Ventilating Blower

The Utilization of Water Power

Copying Camera Holder

An Electro-Photo-Detective Thief Catcher

New Government Lightships

Bushmen Killing a Lion

Parker Gillmore

Experiments with Water Jets

Departments

Correspondence- August 13, 1892

Business and Personal- August 13, 1892

Recently Patented Inventions- August 13, 1892

Notes & Queries- August 13, 1892

To Inventors- August 13, 1892

Index of Inventions- August 13, 1892