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Scientific American Magazine Vol 21 Issue 24

Scientific American Magazine

Volume 21, Issue 24

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Features

Improved Railway Supply Apparatus, Improved Rotary Grates, and More

Metal Spinning

John Anderson

Editorial Summary

H. W. Staples' Automatic Lamp-Filler

Tent Roof Garden Chair

Communication With and Between Deaf Mutes

Seasoning Boards

Aerial Navigation

NUMBER FIVE

Oxygen as a Source of Heat and Light

Adolph Ott

“How to Observe the Sun”

J. N. Farrar

The Manufacture of Lookingglasses and Mirrors

The Great St. Pancras Railway Station

The Origin of Candles

Life-Saving Guns

Progress of Labor

Brain and Muscle

The Steam Engine Indicator

The Spirit of the Age

What We Have Done in 1869 and What We Intend To Do in 1870

Manufacturing, Mining, and Railroad Items

Announcement for 1870.—A Splendid Work of Art and Cash Premiums to be Given

New Publications

Recent American and Foreign Patents

To Keep Cellars From Freezing

How to Obtain Letters Patent for New Inventions

Official List of Patents

Applications for Extension of Patents

Departments

Correspondence

Business and Personal