Volume 9, Issue 18
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Features
Inventions and Discoveries Abroad
Miscellaneous Summary
Scientific Information--British Association for the Advancement Of Science
The Great Works of the Period
The Indian Summer
Tramping Mechanics
The New Postal Currency
Packing the Ends of Condenser Tubes
Concerning Safety Valves
An Astronomer on Boiler Explosions
The Supply of Petroleum
Don't Stand Idle
Prevention of Decay in Wooden and Iron Ships
An Impenetrable Armor Ship
Harbor Defenses
Recent American Patents
Patent Claims
Issued from the United States Patent-Office