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

A Comparison of the German and American Navies

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

Henry Fairfield Osborn

America's Foremost Palaeontologist

The Latest of the Big Railway Terminals

The Chicago Terminus of a Leading Western System

Heart Diagnosis by Electricity

Abstracts from Current Periodicals- July 22, 1911

Phases of Science as Other Editors See Them

An Improvised Bobbin Winder

Turning Ball Joints to Gage

Making a Wooden Tube

Adz-tightener

Home-made Anchors

A Simple Turnbuckle

The Inventor's Department- July 22, 1911

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