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Shive's Watchman's Clock

Improved Steam Heater

Locomotive Boiler Explosion

The Ducking Stool

On the Measurement of Musical Intervals

Horse Hair

Nitrous Oxide or Laughing Gas

Ice Preserver

Berryman's Feed Water Heater

Progress of the Eight Hour Strike

Weight, Pressure, Force, Power, Energy, Work

The Tariff and Tax Reductions

Rapid Transit in New York

A Machine that Talks

Postal Reform

Scientific and Practical Information - July 6, 1872

New Patent Law in Canada - July 6, 1872

Grant and Wilson

Recent American and Foreign Patents - July 6, 1872


  • From the Editor

    Answers to Correspondents - July 6, 1872

  • Letters

    Correspondence - July 6, 1872

  • Departments

    Business and Personal - July 6, 1872

  • Notes and Queries - July 6, 1872

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