Features
The Electro-Magnetic Telegraph
Important Trade Mark Decision
Professor Morse
Frictional Gearing - April 20, 1872
Clothes Line Reel
Measuring the Clearness of the Sky
Scientific and Practical Information - April 20, 1872
Gibbs' Whiffletree
Winn's Shampooing Apparatus
An Improved Grafting Tool
Piston Rod Packing
The Relation of Science to Religion
Drying by the Direct Application of Heat-Distillation
Beet Sugar in the United States
The Advance in the Price of Iron
Steam on the Erie Canal
Recent American and Foreign Patents - April 20, 1872
Departments
- From the Editor
Correspondence - April 20, 1872
Answers to Correspondents - April 20, 1872
- Recommended
New Books and Publications - April 20, 1872
- Departments
Notes and Queries - April 20, 1872
Business and Personal - April 20, 1872
Index of Inventions - April 20, 1872
