Features
On Tin
The Century Plant
On a New Method of Straightening High Chimneys
J. D. Michael's Patent Egg Box
William's Improved Tracelock
Working Millstones With an Air Blast
Apparatus for Purifying the Air
By the Evaporation of Coal Tar, Pitch, Carbolic Acid, Phenic Acid, or Any other Disinfectant for Apartments, or Hospitals
L. S. Clark's Improved Shaft-Bar for Single Sleighs
Platinized Looking-Glasses
Spring Balance for Chemicals
Wood Engravings
Hardening and Tempering Steel
An Inexplicable Power
Inertia and Vis Inerti
The Water Wheel Tests at Lowell
Lockage Waste on Our Canals
Restrictions on the Weighing of Coal
Answers to Correspondents- March 12, 1870
Recent American and Foreign Patents- March 12, 1870
Official List of Patents- March 12, 1870
Departments
- Letters
Correspondence- March 12, 1870
- Recommended
New Books and Publications- March 12, 1870
- Departments
Business and Personal- March 12, 1870
