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Amateur Astronomy

Valuable Contributions made by Volunteer Workers in the Field

By W. E. Plummer

Halos in Minerals

Markings Due to Radium in Rocks, and their Significance

By J. Joly

Cost of Ice making in Small Plants

By R. P. Kehoe

Lighthouses and Buoys of New York Harbor

Safeguards for the Mariner

Prime Movers

Our Debt to James Watt

By S. Z. Ferranti

Progress in Power Production

A Forecast of the Direction of Future Developments

Unmounting and Remounting Photographs

Notes on New York City's Water Supply System

Some Features of Interest at and about Kensico Reservoir

A Strange Case of Abnormal Anatomy

Modern Pumps of High Vacua

The Lowest Pressure ever Attained

By E. N. da C. Andrade

Ten Years of Government Irrigation Work

A Review of the Activities and Experiences of the United States Reclamation Service since the Passage of the Newlands Act

Experimental Psychology and Medicine

By H. L. Hollingworth


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