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An Imminent Railroad Danger, Causes of Aviation Accidents, and more

The Winning of the International Aviation Trophy

How Weymann Upheld Our Colors Single-handed and Won the World's Greatest Speed Event

The Beacon Hill Tunnel

How a Half-mile of the Boston Subway Was Built In Tunnel

By G. D. Emerson

A Comparison of the German and American Navies

Our Great Superiority in Gun-fire Places the United States in the Lead.

By H. D. Brandyce

Henry Fairfield Osborn

America's Foremost Palaeontologist

By Benjamin C. Gruenberg

The Latest of the Big Railway Terminals

The Chicago Terminus of a Leading Western System

Heart Diagnosis by Electricity

By William Day

Abstracts from Current Periodicals- July 22, 1911

Phases of Science as Other Editors See Them

An Improvised Bobbin Winder

By Henry H. Riggs

Turning Ball Joints to Gage

By C. G

Making a Wooden Tube

By W. D. Graves


By W. A. Lane

Home-made Anchors

By Albert F. Bishop

A Simple Turnbuckle

By William Grotzinger

The Inventor's Department- July 22, 1911

Simple Patent Law; Patent Office News; Inventions New and Interesting


  • Recommended

    New Books, Etc.- July 22, 1911

  • Departments

    Notes and Queries- July 22, 1911

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