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Features

The Submarine Boat Gymnote

The Belduke Propeller

A Great Steamer

Ammonia Motors

The Power Station at Niagara

A Combined Wagon and Boat of Aluminum

Professor Wellner's Flying Machine

Alum as a Sensitizing Material for Paper

Experiments on Flying

Some of the Ancient uses of Asphaltum by the Aborigines of California

The Artificial Production of Petroleum

By C. Engler

The Refining of Petroleum Oil

Cloth Oils in regard to Fire Risks

By W. McD. Mackey

Aluminum Battery

Rhea Fiber

Tesla Motors Operated from Single-Phase Two-Wire Alternating Circuits

Counter of Telephone Communications

Studies of the Phenomena of Simultaneous Contrast Color; And on a Photometer for Measuring the Intensities of Lights of Different Colors

By Alfred M. Mayer

Alloys

By W. Chandler Roberts-Austen

Draught Dogs

John Milton's Cottage—A Buckinghamshire Village

Chalfont St. Giles and Jordans

By J. T. Young

The Efficacy of State Food Laws and the Desirability of National Ones

Patents!

Vitality of Cholera Organisms

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    Dwindling Supply. Increasing Demand.

    Dwindling Supply. Increasing Demand.

    Solving the Water Crisis