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The Cere Viaduct, Railway Economy

On Tin

By Charles A. Joy

The Century Plant

By John Ramsay Gordon

On a New Method of Straightening High Chimneys

J. D. Michael's Patent Egg Box

Working Millstones With an Air Blast

William's Improved Tracelock

Apparatus for Purifying the Air

By the Evaporation of Coal Tar, Pitch, Carbolic Acid, Phenic Acid, or Any other Disinfectant for Apartments, or Hospitals

By C. Widemann

Platinized Looking-Glasses

By C. Widemann

L. S. Clark's Improved Shaft-Bar for Single Sleighs

Spring Balance for Chemicals

An Inexplicable Power

Wood Engravings

Inertia and Vis Inerti

Hardening and Tempering Steel

Lockage Waste on Our Canals

The Water Wheel Tests at Lowell

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


  • Letters

    Correspondence- March 12, 1870

  • Recommended

    New Books and Publications- March 12, 1870

  • Departments

    Business and Personal- March 12, 1870

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March 12, 1870

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