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Astronomy for 1915

A Review of the More Notable Events, and Work Accomplished

By P. Puiseux

The Making of a Photographic Objective

Description of a Course in Applied Optics at the Emerson McMillan Observatory, Ohio State University

By H. C. Lord

Swimming-Pool Sanitation

Treatment for Burns

Ancient Volcanoes in South Africa

Army Service Museum

Notes on Carburetion

Principles of Operation and Functions of Vaporizing Devices

By Edward E. Dean

Can Cannon Fire Cause Rain?

Melting down Foreign Gold

What Becomes of the River of Coin Flowing From Europe

A Cheap Disinfecting Fluid

Some Curious Electrical Experiments

The Cultivation of Peanuts

A Valuable Crop that Grows in Many Climates

Simple Astronomical Instruments for the Teacher

The Naval Reserve Force

A Portion of a Bill Approved by Congress August 29, 1916

Permanence of Writing-Ink

The Food Consumption of Adolescent Boys

The Evolution of big Guns

From the Cast Iron Smooth Bore to the Modern Breech-Loader

Clock Faces and Hands

Good Lighting

Some of the Fundamental Principles and Modern Practice

By P. G. Nutting

How to Select Metals for Magnets

By Arthur E. Paige

Behavior of Metals toward Acids


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