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Count De Lambert's Flight over the Eiffel Tower

Slag a Cause of Broken Rails

Our Vanishing Timber Supply

Death of Prof. Lombroso




The Brussels Popular Electrical Laboratory

By Alfred Gradenwitz

A Curious Chemical Growth

Playing with Fire

Measuring Holes by Electricity

Differential Speed Indicator

Accident Preventer

A Surveyor's Telephoto

High-Speed Destroyers for the United States Navy

A Magic Square

Why Do Watch Springs Break?

The Breaking of Main Springs in Storms

Leduc's Figures

An Optical Phenomenon

How Germany Makes Forestry Pay

By Frederic Blount Warren

A Perfected Form of Lock Nut

Sleigh-Runner Attachment for Baby Carriages

Patent Department

An Improved Planter

Oddities in Invention

Combined Friction and Jaw Clutch


  • Index of Inventions

  • Departments


  • The Heavens in November

  • New Books, Etc.

  • Recently Patented Inventions

  • Patents

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October 30, 1909

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