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The Vibrations of Telephone Diaphragms—II

An Experimental Investigation

By Charles F. Meyer and J. B. Whitehead

Electrolysis from Stray Currents—I

Damage Caused to Underground Structures

By Albert F. Ganz

The Eighth International Congress of Applied Chemistry

A Survey of Some of the Principal Papers Presented

Local Irrigation in Egypt

Primitive Methods that Persist to the Present Day

By A. W. Cutler

Some Physiological Considerations in Lighting Problems

The Ideal System would be a Combination of Direct and Indirect Lighting

By W. F. Schaller

Blue Gelatine-Copper

Brilliant Colors from the Colloidal Metal

By W. D. Bancroft and T. R. Briggs

A Simple Method for Purifying Drinking Water

By R. L. Sammis

Oil-Mixed Portland Cement Concrete

Residual Petroleum for Waterproofing Structures

By Logan Waller Page

The Research Corporation

An Experiment in Public Administration of Patent Rights

By F. G. Cottrell


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