Features
Improved Steam Heater
Locomotive Boiler Explosion
The Ducking Stool
On the Measurement of Musical Intervals
Horse Hair
Nitrous Oxide or Laughing Gas
Ice Preserver
Berryman's Feed Water Heater
Progress of the Eight Hour Strike
Weight, Pressure, Force, Power, Energy, Work
The Tariff and Tax Reductions
Rapid Transit in New York
A Machine that Talks
Postal Reform
Scientific and Practical Information - July 6, 1872
New Patent Law in Canada - July 6, 1872
Grant and Wilson
Recent American and Foreign Patents - July 6, 1872
Departments
- From the Editor
Answers to Correspondents - July 6, 1872
- Letters
Correspondence - July 6, 1872
- Departments
Business and Personal - July 6, 1872
Notes and Queries - July 6, 1872
