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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

A Toolholder for Grindstones

By William Grtzinger

How to Measure Closely with Ordinary Calipers

By H. D. Chapman

Two Drilling Kinks

By Fred Horner

Rig for a Two-handed Saw

By Fremont Leland

Device for Holding Screws when Filing them Shorter

By I. B. Spittell

Jig for Turning up Rough-threaded Bolts

By Joe V. Romig

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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