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Features

The Manufacture of Valves

Probable Opportunities for New Discoveries in Acoustics

The Electrical Alarm Compass

The New Bureau of National Survey

How to Preserve Cider

Changes in Photography

Spirit Photographs

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

  • What to do Next Winter

  • Departments

    Correspondence

  • New Books and Publications

  • Business and Personal

  • Notes and Queries

  • Index of Inventions

  • Patents

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August 09, 1879

See the World from a Different Perspective

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