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Features

The Chicago World's Fair

A Summer School of Biology

Ammonia

Trade Mark Decisions

An Improved Safety Latch for Elevator Doors

A New Plating Dynamo

An Improved Fruit Picking Stand

An Imitation Baseball Game

An Improved Log Loading Machine

An Improved Automatic Regulator

An Improved Mail Pouch Catcher

An Improved Dental Tool

An Improved Stone Polishing Machine

An Improved Gravity Hoist

An Improved Header Brake

Home Made Ornaments

The Sodom and Bog Brook Reservoirs in the Croton Basin, N. Y.

Manufacture of Condensed Milk in Switzerland

The New Merchants' Bridge at St. Louis

Burrowing Sea Urchins

Photographic Notes- July 12, 1890

Scientific American Building Edition- July 12, 1890

Departments

  • Recommended

    New Books and Publications- July 12, 1890

  • Departments

    Notes and Queries- July 12, 1890

  • Business and Personal- July 12, 1890

  • Recently Patented Inventions- July 12, 1890

  • Index of Inventions- July 12, 1890

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Know Before You Vote