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The Horizontal Pendulum

Medical Progress in 1877

Stick to the Law

Is Gravity a Mode of Motion?

The Mail of the Metropolis

Heinrich Daniel Ruhmkorff

Patent Office Employees to be Disgraced

Folding-Door Fireproof Safe

Modern Torpedo Warfare

Smith's Improved Windmill

A New Digging Machine


Making Callipers

Powell's Improved Cotton Harvester

Improved Portable Cider Mill

The High School of Kolapore, India

The Long-Necked Chelodine

By C. Few Seiss

Whales and Whalebone

A Fowl Monstrosity

By John Michels

Beard's Thill Coupling

Astronomical Notes

By Berlin H. Wright

Wants and Business Inquiries


  • Departments

    Notes and Queries

  • Business and Personal

  • Index of Inventions

  • Patents

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