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The Nicaragua Canal

Mr. Cramp the Shipbuilder, Replies to his Critics

The New York Water Supply--A Great Dam Decided Upon

Position of the Planets in February

The Unicycle Elevated Railway

An Improved Tappet

A Swing Readily Adjustable for Height

How Heron Solved It

A Device for Reaching High Shelving

The Belt Problem

The Canet System of Firing Torpedoes

Scientific American Building Edition- January 31, 1891

Books on Electricity

Mechanical Drawing

The Scientific American Supplement

The Scientific American- January 31, 1891

Experimental Science- January 31, 1891

By Geo. M. Hopkins


  • To Inventors- January 31, 1891

  • Letters

    Correspondence- January 31, 1891

  • Departments

    Miscellaneous Notes

  • Recently Patented Inventions- January 31, 1891

  • Index of Inventions- January 31, 1891

  • Business and Personal- January 31, 1891

  • Notes and Queries- January 31, 1891

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