Features
New Patent Selling Trick
The Artificial Production of Rain
Opening of the New Pulitzer Building
Tunnel Railways in New York
An Improved Nut Lock
An Adjustable Stuffing Box
Boomer & Boschert's Presses
An Automatic Electrical Damper Regulator
A Hot Water Ventilating Heater
An Easily Operated Belt Tightener
Rail Rolling at the Krupp Works, Essen
A Machine to Sand Brick Moulds
An Improved Article for Plastering, Tiling, and Cement Work
An Improved Lumber Drier
Mr. Brush's Windmill Dynamo
A Pine Apple Grove in Florida
New Marine Signal
To the North Pole in a Balloon
The "Crystal" Water Filter
The Scientific American- December 20, 1890
Departments
- Letters
Correspondence- December 20, 1890
- Departments
Business and Personal- December 20, 1890
Notes & Queries- December 20, 1890
To Inventors- December 20, 1890
Index of Inventions- December 20, 1890
Recently Patented Inventions- December 20, 1890
