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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

The Nordenfelt Gun

Buggy Bow Spring

Improved Hat Holder

The Archer Fish

Engineering Inventions

Mechanical Inventions

Agricultural Inventions

Miscellaneous Inventions


  • Departments


  • Recent Inventions

  • Notes and Queries

  • Business and Personal

  • Index of Inventions

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