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Improved Filters

Analysis of Water

Sites for Water Supplies

Education for Mechanics

Aspects of the Planets for April

Some Answers to Correspondents

New Fanning Apparatus

New Pile for Galvano Cautery

Buggy Bow Spring

The Nordenfelt Gun

Improved Hat Holder

The Archer Fish

Agricultural Inventions

Miscellaneous Inventions

Mechanical Inventions

Engineering Inventions


  • Departments


  • Recent Inventions

  • Business and Personal

  • Notes and Queries

  • Index of Inventions

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March 31, 1883

Confronting Common Wisdom