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Features

Improved Foot Bellows

Dry Printing of Fractional Currency

Remarks on the Subject of Force in General

By John A. Roebling

Polytechnic Association of the American Institute

The Ichneumon Fly and the Dusky Vapor Moth

Rothfelder's Improved Chronometer Escapement

Special Notice

Holden's Shoemaker's Valise

The Way to Raise Blackberries

The Material for Heavy Ordnance

Museum of Natural History

Young's Paraffine Oil Patent

Small Motions

Patents Claims

Issued from the United States Patent-Office

Recent American Patents

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  • Notes and Queries

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