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The Recent Army Aeronautical Accident, Why Not Patents for New Plants and Animals? and more

The German Battle-Cruiser “Moltke”

A Fine Example of a New Type of Fighting Ship

A Scientific Test of the Electric Truck

An Impartial Study of the Comparative Cost of Horse-drawn and Power Vehicles

By John Ritchie

How the Germans Utilize Waste—VI

Wealth That Has Been Earned by the Efficient Use of Raw Material

By Waldemar Kaempffert

What is the Montessori Method?

Application of Science to Education

By Sidonie Matzner Gruenberg

Animal Masquerades

A Demonstration by Abbott H. Thayer of Color Marking and its Effect

A Three-line Drafting Pencil

By George W. Colles

How to Determine the Thrust of a Propeller

By J. V. Romig

Suggestions for the Workshop

Ingenious Expedients of Resourceful Mechanics

By Albert F. Bishop

How to Extract a Damaged Screw

By William Gr*amp*ouml;tz*amp*iacute;nger

Sawing Tubing at an Angle

By H. D. Chapman

Co-operative Fire Protection for Small Communities

A Novel Experiment Conducted at Fort Smith, Arkansas

Formic and Lactic Acids, American Road Congress and more


  • Departments

    Correspondence - June 22, 1912

  • Inventions New and Interesting

  • Recently Patented Inventions - June 22, 1912

  • New Books, Etc. - June 22, 1912

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