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Features

Glue Testing

By S. Rideal

The New Statue of Franklin in Philadelphia

Pictures Produced on Photographic Plates in the Dark

Lathe Milling Attachment

Large Condensing Plant

Trade Suggestions from United States Consuls

Electrical Notes

Selected Formulæ

Engineering Notes

Magnetism Illustrated by Air Currents

An Automobile Journey in Tyrol

Operating Costs of Horse and Electric Delivery Wagons in New York City

By G. F. Sever and R. A. Fliess

The Restio Family

Mapping the Mammoth Cave

By Horace C. Hovey

Progress in the Iron and Steel Industries

Gigantic Insects

History of Weather Telegraphy

Patents!

The Chemistry of Sausages

The Salt in Salt Lake

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    July 22, 1899

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