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Automatic Cab-Signa Ling

A Discussion of Modern Railway Safety Devices

By J. Pigg

Locomotive Weighing Machine

Mechanical Flight

Slowness and Not Speed the Desideratum

New Form of Grip-Jaw Clutch Coupling

Piston Speed and Steam Engine Economy

By R. L. Weighton

City Refuse and its Disposal

A Difficult Metropoliten Problem

By H. De B. Parsons

Studying the Condor in its Native Haunts

By William L. Finley

Fungi Destroying Eastern Forests

The Diseases of Trees

By William Hosea Ballou

Korn's New Telephotographic System.—I

Sending Pictures by Wire from Paris to London

Formic Acid as a Substitute for Acetate of Lime

Trade Notes and Formulæ

Electrical Notes

Engineering Notes


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