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Features

Is Perpetual Motion Possible?

The Camera at Homestead

Position of the Planets in August

An Easily Regulated Electric Motor

An Improved Car Coupling

A Machine to Holystone a Vessel's Deck

A Comfortable Reading Chair

The Viaduct Du Loup

The Oscillating Disappearing Turret

Mechanical Singing Birds

The Baker Submarine Boat

Polychrome Projections by Means of Uncolored Photographs

Departments

  • Letters

    Correspondence- July 30, 1892

  • Departments

    Recently Patented Inventions- July 30, 1892

  • To Inventors- July 30, 1892

  • Notes and Queries- July 30, 1892

  • Index of Inventions- July 30, 1892

  • Business and Personal- July 30, 1892

  • Patents- July 30, 1892

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July 30, 1892

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