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

Town Sewage as Manure

The Passage of Heat through Water

Farmers' Club

Patent Claims

Issued from the U. S. Patent Offic

Davis's Bolt Header

Mechanics

Inventors, Manufacturers