Volume 18, Issue 19
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Features
Editorial Correspondence
Patent Telescopic Speaking Trumpet
Another Optical Illusion
Martin's Patent Safety Swing
A Flying Parachute
The Construction of Watches
Locke's Self-Lighting Gas Burner
Pictorial Printing
Recent American and Foreign Patents
Manufacturing Mining, and Railroad Items
Extension Notices
Answers to Correspondents
New Publications
To Inquiring Correspondents
The Polytechnic Club of the American Institute
Constructive Mechanics and Educational Means
Forging by Drops and by Hammering
The Wheel Question
Water Meters
Official Report of Patent and Claims
Issued by the United States Patent Office