Features
Collecting and Removing Scums from Boilers
A Navigable Balloon
The Parkes Silver Extracting Process in Germany
Rotary Engines
Determination of High Degrees of Heat by the Melting of Ice
Hallidie's Wire Rope Way for Transporting Ores
Precipitation of Arsenic by Heat in Marsh's Test
Scientific and Practical Information
Beach's Spark Catcher and Consumer
Himmer's Electric Battery
Ketchum's Pitman Connection
The Electro Magnetic Telegraph
The Problem of Flight
Light Versus Heavy Shafting
Recent American and Foreign Patents
Departments
- From the Editor
Answers to Correspondents - March 23, 1872
- Letters
Correspondence - March 23, 1872
- Recommended
New Books and Publications - March 23, 1872
- Departments
Notes and Queries - March 23, 1872
Business and Personal - March 23, 1872
Index of inventions - March 23, 1872
