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Features

Improved Sugar Evaporating Apparatus

How Felt Hats Are Made

Adulteration of Chemicals

Direct-Acting Steam Engine

Blacksmith's Butteris

The New Water Front, New York City

Fireless Locomotive

Sash Coupling Machine

The American Association for the Advancement of Science

Canadian Patents - August 24, 1872

The Aurora

Country Churchyards

Influence of Variously Colored Light on Animal and Vegetable Growth

Plaster Casts

Letter from Professor R. H. Thurston - August 24, 1872

Miscellaneous Items - August 24, 1872

Recent American and Foreign Patents - August 24, 1872

New Patent Law in Canada - August 24, 1872

Departments

  • From the Editor

    Answers to Correspondents - August 24, 1872

  • Letters

    Correspondence - August 24, 1872

  • Recommended

    New Books and Publications - August 24, 1872

  • Departments

    Business and Personal - August 24, 1872

  • Notes and Queries - August 24, 1872

  • Index of Inventions - August 24, 1872

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August 24, 1872