Volume 20, Issue 5
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Features
Salt-Cake in Dyeing
Manganese--Its Useful Applications in the Arts
Notes on the Velocipede
Something New in Steel
How to Construct a Toy Steam Engine
Water Power of the Connecticut--The Holyoke Dam
Obituary--Death of a Naturalist
Faint's Patent Stovepipe Joint
Does American Industry Need Protection?
Central Lake Navigation
Is Labor-Saving Machinery the Enemy of Labor?
Obstacles in the Way of the Success of Inventors
Primeval Chemistry--Lecture by Professor J. Sterry Hunt
Kerosene Oil--Report of Prof. Chandler to the Metropolitan Board of Health
Recent American and Foreign Patents
Editorial Summary
Official List of Patents
Issued by the United States Patent Office