Features
The Centennial of the United States Patent System
A Regulator for Dynamos and Motors
A Convenient Ear Trumpet
An Improved Copy Holder
Railroad Sleepers Arranged in Pairs
A Device to Block Cars on a Grade
An Improved Metallic Railway Tie
An Improved Pipe or Flue Cutter
An Improved Velocipede
A Pipe Cutter, Beader, and Expander
A Pug Mill for Brick Makers
The Hudson River Bridge
The Manufacture of Salt at Syracuse, N. Y.
The Sebae or Silk Cotton Tree
The Codonophone
An Instantaneous Shutter for Hand Cameras
The Belt Problem
A Nautico-Terrestrial Velocipede
Departments
- Letters
Correspondence- December 13, 1890
- Recommended
New Books and Publications- December 13, 1890
- Departments
Business and Personal- December 13, 1890
Recently Patented Inventions- December 13, 1890
Notes & Queries- December 13, 1890
To Inventors- December 13, 1890
Index of Inventions- December 13, 1890
