The Cere Viaduct, Railway Economy

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