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Features

The Proposed Niagara Bridge at Lewiston, N. Y

Accurate Alignments

Metaline at the American Institute

Flying Machines - February 20, 1875

Bogus State Laws Concerning Patent Rights

Not the Best Way to Sell a Patent

The "Science" of Spiritualism

Irrigation in Colorado

Improved Water Motor

Scientific and Practical Information

Measuring Mountains

The Voices of Animals

By James Orton

Recent Researches in the Spectra of the Planets

Wellman's Improved Car Seat

Improved Plenum and Vacuum Pump

Hayden's Revolving Cartridge Belt

A New Sad Iron

A Hairy Faced Family

Ocean Telegraphy.--The Foreign Connections of New York City and the Existing Rates of Charges

Decisions of the Patent Office - February 20, 1875

The Post Office a Carrier of Merchandise

Recent American and Foreign Patents - February 20, 1875

Canadian Patents - February 20, 1875

Communications Received - February 20, 1875

Departments

  • Letters

    Correspondence - February 20, 1875

  • Recommended

    New Books and Publications - February 20, 1875

  • Departments

    Business and Personal - February 20, 1875

  • Notes and Queries - February 20, 1875

  • Index of Inventions - February 20, 1875

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February 20, 1875