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Features

Prevention of the Sliding Friction of Ball and Roller Bearings

A Portable Recorder for Tests of Metals

By G. C. Henning

Railway Building in the Nubian Desert

Perpetual Motion.—VI

Steam Power in the Fishing Business in Europe

By Charles Theodore Mason

The First-Class Torpedo Boat Injeniero Hyatt

Direct Photo-Lithography on Stone

On Practically Available Processes for Soldering Aluminum in the Laboratory

A Hertz Wave Model

Electrical Notes

Engineering Notes

Miscellaneous Notes

Production of Statuary

Common Plants

Nepenthes X Tiveyi

A Fight of Polar Bears

A Hand-Shaped Carrot

Are Geniuses Long Lived ?

The Manufacture of Tin Plates

By George B. Hammond

John Cabot and the Discovery of Newfoundland

Patents!

Departments

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    October 16, 1897

    Beyond XX and XY

    Biology. Identity. Equality.