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Features

Merchant Vessels as Armed Cruisers

Improved Steam Hammer

Torpedo Boats in War

Tempered Glass

By Frederick Siemens

Amateur Mechanics

Lens Making

Purification of Water for Industrial Purposes

Rapid Smelting Plant

Suggestions in Art.—Theseus Conquering the Centaur

By A. Canova

Liquefaction and Solidification of Formene and of Nitric Oxide

By K. Olzewski

The Physics of Tenuity

A Recent Case of Hydatids

Notes on the Periodical Cicada

By C. V. Riley

Grooved Bed for Gas Pipes

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