Volume 7, Issue 24
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Features
Ordnance Department--Guns and Iron-Clads
The President's Message
Increase and Condition of the Navy--The Report of the Secretary
The “Great Eastern”
Warming and Ventilation of Buildings
Domestic Economy
The Pitch of Machine Screws
Our Ship-Yards
New Method of Drawing Tapes Bolts
The “Passaic” on Trial
Compressed Air Power
Progress of the Mechanic Arts
Valuable Receipts
The Innovations of the Age
Seventeen Thousand Patents Secured Through Our Agency
Miscellaneous Summary
Foreign Scientific Items
Sir David Brewster on the Patent Laws
Patent Claims
Issued From The United States Patent Office