Volume 12, Issue 9
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Features
Dry Printing of Fractional Currency
Remarks on the Subject of Force in General
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
Small Motions
The Material for Heavy Ordnance
Museum of Natural History
Young's Paraffine Oil Patent
Patents Claims
Issued from the United States Patent-Office