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Compound Chair for Connecting Railroad Rails

Improved Duplex Safety Gun Lock

Carbonic Acid in the Soil

Astronomical Effects of the Ocean Tides

A Simple Method of Improving the Health of Cities

Steam on the Farm

Nebraska Patent Laws

European Street Car Improvements

Eccentric Inventors

A New Mitrailleuse

A Munificent Gift to Science

The Ignition of Combustibles by Overheated Steam

Sound and Hearing

Telegraph Poles

Scientific and Practical Information

High Steam Gage and Low Water Register

Improved Radial Drilling Machine

Flexible Saw and Tooth Filing Apparatus

Decisions of the Courts

Recent American and Foreign Patents

Best Mode of Introducing New Inventions

Answers to Correspondents


  • Departments


  • Business and Personal

  • Notes and Queries

  • Index of Inventions

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April 12, 1873

20% Sitewide for President's Day