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Features

A School of Ship Building--The Objects and Ideas of Its Founder

The Centennial of the United States Patent System

A Regulator for Dynamos and Motors

A Convenient Ear Trumpet

An Improved Copy Holder

Railroad Sleepers Arranged in Pairs

A Device to Block Cars on a Grade

An Improved Metallic Railway Tie

An Improved Pipe or Flue Cutter

An Improved Velocipede

A Pipe Cutter, Beader, and Expander

A Pug Mill for Brick Makers

The Hudson River Bridge

The Manufacture of Salt at Syracuse, N. Y.

The Sebae or Silk Cotton Tree

By J. F. Coonley

The Codonophone

An Instantaneous Shutter for Hand Cameras

The Belt Problem

A Nautico-Terrestrial Velocipede

Departments

  • Letters

    Correspondence- December 13, 1890

  • Recommended

    New Books and Publications- December 13, 1890

  • Departments

    Business and Personal- December 13, 1890

  • Recently Patented Inventions- December 13, 1890

  • Notes & Queries- December 13, 1890

  • To Inventors- December 13, 1890

  • Index of Inventions- December 13, 1890

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December 13, 1890

Beyond XX and XY

Biology. Identity. Equality.

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