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Guns for Attacking Airships

A Review of Present Solutions of the Problem

Tests of a Milwaukee Destructor

Roofing for Ferry-Slip Piles

A New Idea in Piles

Practice and Theory of Aviation.—IV

The Leading Aeroplanes

By Grover Cleveland Loening

High-Frequency Measurements

Apparatus for Determination of Constants

The Ultra-Rapid Cinematograph

By C. V. Boys

By Cable to the Arctic

The Realization of a Dream

By George E. Walsh

German Airship Sheds

A New Style of Architecture

Solid Forged and Rolled Steel Car Wheels

A Smelting Charge Calculator

Balling's New Instrument

The Fertility of the Soil

Chemistry and Farming

By A. D. Hall

The Meteorological Isograms

A Rapidly Growing Family of Curves Descended from Alexander von Humboldt's “Isotherms”

By C. Fitzhugh Talman

Recent Study of Radium

New Researches in the Field of Radioactivity

By F. Henrich

Science Notes

Trade Notes and Formulæ


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