Scientific American Magazine
Volume 42, Issue 20You are currently logged out. Please sign in to download the issue PDF.
Features
"American Industries-No. 42" - (American Industries.--No. 42)
Steam Injectors
The Registration of Trade Marks
The Use of Steel for Structural Purposes
The Telegraph Set Screw
Two Tons of Silver Per Week
Improved Telephone Central Office Switch Board
Recent Telephone Experiments
The Coffee Product
Improved Gang Plow
New Dump Car
The Gower System of Telephonic Communication, Paris
Agricultural Inventions - May 15, 1880
Miscellaneous Inventions - May 15, 1880
Mechanical Inventions - May 15, 1880
Novel Tool Handle
Improved Gun Wad
New Rotary Engine
A Chapter on Trout
Engineering Inventions - May 15, 1880
Flowers and the Weather
Communications Received - May 15, 1880
Departments
New Inventions - May 15, 1880
Correspondence - May 15, 1880
Business and Personal - May 15, 1880
Notes and Queries - May 15, 1880
New Books and Publications - May 15, 1880
Index of Inventions - May 15, 1880
Patents - May 15, 1880
