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Inconclusive Tests of the Scout Cruisers

Longer Daylight

Suburban Traffic in London and New York




An English Electrically Operated Evaporative Condenser Plant

By Frank C. Perkins

A New Electric Traveling Scale Crane

By Walter Bailey

A Billiard Table for Ships

By Harold J. Shepstone

Second Honorable Mention Essay on the Fourth Dimension

By F. C. Ferry

The Number of our Ancestors

The Proposed Montreal Drydock

A New Scotch Elevating Ferry

By William Carlin

Signaling to Mars

Constructing the Concrete Locks of the Panama Canal

By H. Prime Kieffer

Foods and Digestion

Handy Man's Workshop

Quick Means for Finding the Center of Shafts

By Albert Prather

Iceless Refrigeration

By Edward Thorpe

A Home-Made Saw Vise

By James G. Newland

A Weatherboard Gage

By I. G. Bayley


  • Departments

    Correspondence - July 17, 1909

  • Recently Patented Inventions - July 17, 1909

  • New Books, Etc. - July 17, 1909

  • Notes and Queries - July 17, 1909

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