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Features

Telescopic Photography

Instruments for Drawing Curves

By C. W. MacCord

Hydraulic Hoisting Carriage for Purifier Covers

Some Type Writers—Their Origin and Uses

By J. B. Huling

Instantaneous Photography

An Absolute Barometer

The First Type Writing Machine

The Strength of Fly-Wheels

The SS. Nulli Secunda

Concrete in Harbor Work

Benz's Gas Motor

Unsuspected Dangers with Frictional Electricity in Blasting

By W. E. Irish

Pure Ice and Snow

Solution

Opening of the Discussion by Prof. Tilden

Fifty Years of Sanitation

Departments

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    January 01, 1887

    Beyond XX and XY

    Biology. Identity. Equality.