Features
Annual Report of the Commissioner of Patents
Landon's Mill-Stone Bush
The Vibrations of Atoms
Polytechnic Association of the American Institute
Winters' Card Rack
Breech-Loaders and the Bayonet
Recent American Patents
Sizes for Key Seats
The Cork!
Colburn's Bracket Lamp Chimney
Spirits of Turpentine
Bearing Surfaces
Patent Claims and Patent Business
Tyndal on Boiler Explosions
Holes in Furnace Doors
The Slip of Propelling Instruments
Will Sudden Relief from Pressure Cause Boiler Explosions?
Patents Granted for Seventeen Years!
Rates of Advertising
To Our Readers
The Cheapest Mode of Introducing Inventions
Valuable Work for Inventors Patentees and Manufacturers
Improved Evaporator, Plumbago Mine in Lower Canada
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Correspondence
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