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Radiations from atoms and Electrons—III

A Study of the Character of thc Mechanism Within the Atom

By J. J. Thomson

A Test of Physical Fitness

Photometry of the Gas-Filled Lamp

Effects of Sulphur in Cast Iron

The Military Rifle

A Review of the History of the Development of the Breech Mechanism

By Douglas T. Hamilton


How it is Extracted for Making Gas Mantles

By Thurston Owens

Artificial Limbs

And Prothetic Apparatus for the Crippled

Economy in Study—III

Books and Their Educative Use

By George Van N. Dearborn

Modeling Clay

The Rennerfelt Electric Furnace

A Successful Device for Use in Foundries

Removing Paint from Wood

Explosibility of Gases from Mine Fires

Coating for Blue-Print Paper

Economical Method of Preparing Potassium Ferricyanide

How to Value Gems

A Description of the Natural and Artificial Features That Determine the Quality

Electric Railway Operation Successful

Strength of Zinc-Bronze Alloys


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