Scientific American Magazine
Volume 21, Issue 24You are currently logged out. Please sign in to download the issue PDF.
Features
Improved Railway Supply Apparatus, Improved Rotary Grates, and More
Metal Spinning
Editorial Summary
H. W. Staples' Automatic Lamp-Filler
Tent Roof Garden Chair
Communication With and Between Deaf Mutes
Seasoning Boards
Aerial Navigation
Oxygen as a Source of Heat and Light
“How to Observe the Sun”
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
