Volume 13, Issue 5
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Features
Patents and Monopolies
Report of the Smithsonian Institution
Tin--How Sampled, Assayed and Smelted
Recent English Patents
How to Set a Slide Valve
Fictitious Amethysts
Toggle Joints as Power
The Law of Patents
Work and Power
Steam Jets in Fires Lengthening the Flame
What Came of it
Launch of the Dunderberg
Special Notices
The Sky Now
Patent Claims
Issued from the United States Patent-Office