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Death of Prof. Lombroso

Count De Lambert's Flight over the Eiffel Tower

Our Vanishing Timber Supply

Slag a Cause of Broken Rails




The Brussels Popular Electrical Laboratory

By Alfred Gradenwitz

A Surveyor's Telephoto

Accident Preventer

Differential Speed Indicator

Measuring Holes by Electricity

Playing with Fire

A Curious Chemical Growth

High-Speed Destroyers for the United States Navy

Leduc's Figures

The Breaking of Main Springs in Storms

An Optical Phenomenon

A Magic Square

Why Do Watch Springs Break?

How Germany Makes Forestry Pay

By Frederic Blount Warren

Patent Department

An Improved Planter

Sleigh-Runner Attachment for Baby Carriages

Combined Friction and Jaw Clutch

Oddities in Invention

A Perfected Form of Lock Nut


  • Departments


  • The Heavens in November

  • New Books, Etc.

  • Recently Patented Inventions

  • Index of Inventions

  • Patents

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