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The Chicago Police Telephone and Patrol System

Legislating Against Progress

Our City Sewerage

Permanent Pictures on the Retina

Pickett's Cave

By H. C. Hovey

New Cooling Cask

Cane with Toilet Combination

Richard's Registering Barometer

Reversible Tools

New Game Counter

Engineering Inventions

A Mechanical Finger for Use in the Photographing of Engravings

Bursting of Fly-Wheels

By Geo. M. Hopkins

Machine for Grinding Bands on Goblets

A Curious Inhabitant of the Sargasso Sea and Its Nest

Sevres Vase

Blackford's Trout Show

Ozoniferous Plants


  • Departments

    Recent Inventions

  • New Inventions

  • Business and Personal

  • Notes and Queries

  • Index of Inventions

  • New Books and Publications

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April 23, 1881

20% Sitewide for President's Day