Volume 19, Issue 20
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Features
On a “Piece of Chalk”.--A Lecture to Workingmen
The Best Modes of Testing the Power and Economy of Steam Engines
Hancock's Screw Propeller
Testing the Power of Steam Engines
The Natural and the Artificial
Recent American and Foreign Patents
Speed of Railway Trains
Manufacturing, Mining, and Railroad Items
Editorial Summary
New Publication
Answers to Correspondents
“Gold! Gold! Hard to Get and Heavy to Hold.”
Comparison and Relation the Only Criterion of Size
Caveats
Expansion of Ice
European Patents
Self Education
Transportation of Cattle--Reid's Patent Cattle Wagons
New Mexico, Its Natural Wealth
On a Probable Connection Between the Resistance of Ships and Their Mean Depth of Immersion
Patents and Claims
Issued by the United States Patent Office