Features
Official Test of the New Army Wire Gun
Sine-Wave Telegraphy
What Our Consuls are doing for American Trade
A Parisian Egg Forger
American Machine Tools in England
The Heavens in May– April 29, 1899
National Academy of Sciences
The Marvin Electric Rock Drill
A Convertible Plow
An Improved Band-Saw-Setting Machine
A Cheap Method of Making a Calorimeter
An Automatic Spring Fish-Hook
An Improved Lemon-Squeezer
Sutro Baths of San Francisco
Manufacture of Krag-Jorgensen Rifles at the Springfield Armory.--I
The Californian Sea Lion
To Inventors - April 29, 1899
Departments
- Letters
Correspondence - April 29, 1899
- Recommended
New Books Etc - April 29, 1899
- Departments
Recently Patented Inventions - April 29, 1899
Business and Personal - April 29, 1899
Notes and Queries - April 29, 1899
Index of Inventions - April 29, 1899
Patents - April 29, 1899
