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Improved Convertible Fence

On Packing Metallic Rods

Practice at Scrap-Iron Target No. 10

With Rubber One Inch Thick Placed Between the Front Plate and Timber. July 28, 1862

The Machinists and Their Troubles

Bennett's Rubber With Iron Target

Practice at Iron Plate Target No. 15

With rubber placed between the plates and timber

Palmer's Pulley Block


Another Year Closed

The People's College

Concerning Steam Boilers

Recent American Patents

Patent Claims

Issued from the United States Patent-Office



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    December 26, 1863

    Science for the Modern World