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Features

Improved Hot-Pressing Machine

Foul Air Signal

The Knowledge of the Truth

Practical Results of the Eight Hour Plan in New York

Poisonous Air in Schools and Factories

Invertebrate Men

Colburn's Theory and the Boiler Explosion at Pittsburgh

Scientific and Practical Information

The King Penguin and the Australian Bustard

Elastic Washer

Sectional Life Boat

Phosphor-Bronze Tweers

Odd Materials for Paper Making

Improved Grain Cleaner

Steam Reaper and Mower

Bridge Over the Missouri River, Near Leavenworth, Kansas

Recent American and Foreign Patents

Answers to Correspondents

Communications Received

Departments

  • Departments

    Correspondence - March 15, 1873

  • New Books and Publications - March 15, 1873

  • Business and Personal - March 15, 1873

  • Notes and Queries - March 15, 1873

  • Index of Inventions - March 15, 1873

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March 15, 1873

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