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With Eye-Piece and Camera

Recent British Developments in Petrological and Metallurgical Microscopy and Photography

By Albert A. Hopkins

The Radio Central

America's Bid for World-Wide Wireless Supremacy as Crystallized in the Huge Station at Rocky Point

By Austin C. Lescarboura

The Noiseless Elevated

Philadelphia's Plans for Making Conversation Possible while the Trains are Passing

By William A. McGarry

The Hydraulic Jump

How Nature's Treatment of Rapids and Waterfalls is Copied in Ohio's Big Impounding Dam

Noises for the Movies

How various Realistic Sounds are Produced by means of Ingenious Drummer's Traps

By Albert A. Hopkins

New York's Proposed Belt Railway

Substituting Direct Rail Connection for Costly Car-Float and Lighter Transfer between Rail, Warehouse and Dock

By William J. Wilgus

Design Patents

What they are, and the Rules Governing Recovery for Infringement of them

By T. Hart Anderson

A Garbage Crisis

Must we Solve Anew the Problem of the Disposition of Domestic Wastes?

By Harry A. Mount


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