Volume 24, Issue 25
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Features
Young's Improved Hot Air Register
Schopp's Push Chair or Ice Velocipede
Manufacture of Varnish in England
The Application of Steam to Canals--No. 2
Mechanical Tests
Tools for Cutting Metals
The Illinois and St. Louis Bridge
Wood-Boring Beetles
Improvement in Extracting Spirits of Turpentine from Pine Wood
The Proposed Centennial Exhibition in Philadelphia, in 1876
Guess Work and Real Work
Repairing Roads
The Electric Light
A Great Speech
Scientific Intelligence- June 17, 1871
Klinkerfues' Apparatus for Igniting Gas and Other Lights
Answer to Correspondence- June 17, 1871
Queries- June 17, 1871
Applications for Extension of Patents- June 17, 1871
Official List of Patents- June 17, 1871
Issued by the U. S. Patent Office