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Improved Hot-Pressing Machine

Poisonous Air in Schools and Factories

Invertebrate Men

Practical Results of the Eight Hour Plan in New York

The Knowledge of the Truth

Foul Air Signal

Colburn's Theory and the Boiler Explosion at Pittsburgh

Scientific and Practical Information

The King Penguin and the Australian Bustard

Phosphor-Bronze Tweers

Elastic Washer

Sectional Life Boat

Odd Materials for Paper Making

Steam Reaper and Mower

Improved Grain Cleaner

Bridge Over the Missouri River, Near Leavenworth, Kansas

Recent American and Foreign Patents

Answers to Correspondents

Communications Received


  • Departments

    Correspondence - March 15, 1873

  • New Books and Publications - March 15, 1873

  • Notes and Queries - March 15, 1873

  • Business and Personal - March 15, 1873

  • Index of Inventions - March 15, 1873

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