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Features

Improved Steam Trap

Writing Fluids

Adjustable Plow

Double Turbine Water Wheel

Improved Shops

Simple Apparatus for Out-Door Sketching

Paper Boats—How Made

The Carpenter Bee

Scientific and Practical Information - September 14, 1872

Albany Steam Trap

Railway Rail Joint

The Star Sirius

Substances Acting Mechanically to Prevent the formation of Scale in Boilers

Terrestrial Magnetism - September 14, 1872

Renewed Activity at the Patent Officer—Re Organization and New Classification—Appointment and Promotions

The Newark Industrial Exposition

An Astronomical Robbery

Letter from Professor R. H. Thurston - September 14, 1872

Recent American and Foreign Patents - September 14, 1872

Foreign Patents—A Hint to Patentees

New Patent Law in Canada - September 14, 1872

Departments

  • From the Editor

    Answers to Correspondents - September 14, 1872

  • Letters

    Correspondence - September 14, 1872

  • Recommended

    New Books and Publications - September 14, 1872

  • Departments

    Business and Personal - September 14, 1872

  • Notes and Queries - September 14, 1872

  • Index of Inventions - September 14, 1872

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September 14, 1872

Beyond XX and XY

Biology. Identity. Equality.

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