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Features

The Development of the Electric Mining Locomotive.—II

By Frank C. Perkins

Electrolytic Rectifiers for Charging Storage Batteries with Alternating Current

By Charles F. Burgess

Remarkable and Rare Effects of Lightning

Purification of Potable Water by means of Ozone

By GG. Erlwein

Some Data on the Cost of Operating Automobile's for Commercial Purposes

By Hiram Percy Maxim

The Steam Turbine

By H. M. Gleason

The Menhaden Industry

By Charles H. Stevenson

Electricity and Therapeutics

The Adaptation of an Automobile to a Railway Track

Wire-Rope Tramways

California Holsteins

By Janet MacDonald

Contemporary Electrical Science

Trade Notes and Recipes

Engineering Notes

Electrical Notes

Trade Suggestions from United States Consuls

Selected Formulæ

Patents!

Departments

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    April 30, 1904

    Beyond XX and XY

    Biology. Identity. Equality.

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