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Features

Original Work in America

A Propelling Mechanism for Vehicles

An Improved Wrench

A Readily Applied Car Replacer

A Quilter for Sewing Machines

A Mechanical Stoker

Fireproof Partition Walls

A Tool Holder for Lathes, Planers, Etc.

The Patent Centennial

Optical Projection of Opaque Objects

By Geo. M. Hopkins

A SuccessfuI Life

By John P. Lovell

To Inventors

Advertisements- April 4, 1891

Inside page, each insertion — 75 cents a line Back page, each insertion — $1.00 a line

Useful Books!– April 4, 1891

Experimental Science- April 4, 1891

By Geo. M. Hopkins

The Scientific American Publications for 1891- April 4, 1891

The Scientific American Established 1846- April 4, 1891

The Most Popular Scientific Paper in the World

Departments

  • Letters

    Correspondence- April 4, 1891

  • Recommended

    New Books and Publications- April 4, 1891

  • Departments

    Miscellaneous Notes- April 4, 1891

  • Recently Patented Inventions- April 4, 1891

  • Notes & Queries- April 4, 1891

  • Business and Personal- April 4, 1891

  • Index of Inventions- April 4, 1891

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April 04, 1891

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