Volume 18, Issue 20
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Features
Rationale of the Therapeutic Action of Arsenic in Diseases of the Skin
The Watch--Its History and Manufacture
Alloys--Review of a Lecture by Dr. A. Matthiesen, F. R. S
Editorial Summary
American Institute Polytechnic Club
Controlling Water Currents--Deepening the Channels of Rivers
Recent American and Foreign Patents
Manufacturing Mining, and Railroad Items
Answers to Correspondents
Curley's Patent Adjustable Curtain Fixture
Wheeler's Adjustable Pulley for Attaching to Shafts in Place
De Galleford's Improved Pipe Cutter
Aluminum--A Field for Scientific Effort
Great Reduction in Cost of Foreign Patents
“The Wheel”
Etching Glass--One of the Uses of Fluor Spar
The Value and Uses of Worn-Out Files
Importance of Studying Cause and Effect--A Hint to Inventors
Patents and Claims
Issued by the United States Patent Office