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Influence of Light on the Conductivity of Antimonite

Tunnel Tubes in Soft Material

The Problem of Raising an Existing Dam Structure

The Shackleton Antarctic Expedition

Government Tests of Safety Devices for Mines

The Largest Arch Bridge in the World

The Two Competitors in the Motor Boat Race to Bermuda

Mining in Newfoundland

By Day Allen Willey

Teaching Deaf-Mutes to Speak

Nature's Touch-Me-Nots

By Percy Collins

Combined Lightning Arrester, Fuse Box, and Insulator

A New Method of Handling Acids

A Novel Sash Lock

Improved Grass Cutter


  • Departments


  • Notes and Queries

  • Recently Patented Inventions

  • Index of Inventions

  • New Books, Etc.

  • Patents

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The Essential Guide to the Modern World

The Essential Guide to the Modern World