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Features

Improved Bridge, Copper Ore Roasting--Sulphuric Acid

Report of the Commissioner of Patents

Chesley's Globe Valve

Proteus--The New Optical Deception

Garrett's Hay Fork

Polytechnic Association of the American Institute

Plimpton's Parlor and Ice Skates

A Point Overlooked

The Passage of Heat through Water

Farmers' Club

Town Sewage as Manure

Patent Claims

Issued from the U. S. Patent Offic

Mechanics

Inventors, Manufacturers

Davis's Bolt Header

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  • New Inventions

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