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Science and the Cost of Living, Cold Light and more

A Hydraulic Variable Speed Gear

A Power Transmission Mechanism Consisting of a Pump and Engine Couple

Dussaud's "Cold Light"

Its Remarkable Applications

By Jacques Boyer

Plans for the Disposal of New York's Sewage

A Treatment Plant on an Artificial Island Three Miles Offshore

Recent Assaults Upon the Patent System: What they Mean to Manufacturers, The Current Supplement

The Brazilian Battleship "Rio de Janeiro", Cork Paper and its Uses

By Oscar Parkes

A New Parseval Airship, The Good Roads Movement and more

By Walter Isendahl

Mending a Broken Steel Tape

By George W. Colles

Hint for Boring a Straight Hole

By Joseph Vaghi

Two Drilling Kinks

By Fred Horner

A Toolholder for Grindstones

By William Grtzinger

How to Measure Closely with Ordinary Calipers

By H. D. Chapman

Rig for a Two-handed Saw

By Fremont Leland

Jig for Turning up Rough-threaded Bolts

By Joe V. Romig

Device for Holding Screws when Filing them Shorter

By I. B. Spittell

An Automobile Field Kitchen, Tar Bonded Roads in Cincinnati

By Our Berlin Correspondent

Don, the "Talking" Dog, Naphthalin as a Binder for Anthracite Briquettes

By Leonard Keene Hirshberg


  • Departments

    The Heavens in June 1913

  • Inventions New and Interesting - May 31, 1913

  • Recently Patented Inventions - May 31, 1913

  • The Motor-Driven Commercial Vehicle - May 31, 1913

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