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The Manufacture of Valves

What to do Next Winter

How to Preserve Cider

Spirit Photographs

Changes in Photography

The Electrical Alarm Compass

Probable Opportunities for New Discoveries in Acoustics

The New Bureau of National Survey

Improved Pressing Machine

A New Railroad Tie

Improved Grinding Mill

Engineering Inventions

New Agricultural Inventions

A New Optical Delusion

Improved Nut Lock

Improvement in Saw Gumming

The Narica

Miscellaneous Inventions

Recent Mechanical Inventions

Communications Received


  • Departments


  • Business and Personal

  • New Books and Publications

  • Notes and Queries

  • Index of Inventions

  • Patents

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