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Scientific American Magazine Vol 66 Issue 4

Scientific American Magazine

Volume 66, Issue 4

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Features

Improvements Needed in the New Navy

The Ammonia Motor

An Improved Piano Action

Improved Safety Devices for Elevators

An Improved Freight Car Door

Towing Canal Boats by Electricity

A Method of Tunneling

Harold Avery

Improved Siphon Condenser

Vertical Cylinder Boring Machine

The World's Fair Franklin Statue

A Bow for Stringed Musical Instruments

An Improves Dumping Car

An Improved Weed Puller

To Inventors- January 23, 1892

Patents- January 23, 1892

Departments

Correspondence- January 23, 1892

Recently Patented Inventions- January 23, 1892

Notes and Queries- January 23, 1892

New Books and Publications- January 23, 1892

Business and Personal- January 23, 1892

Index of Inventions- January 23, 1892