Volume 15, Issue 2
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Features
Why a Gun Becomes Hot on Firing
The Spectroscope and Its Revelations
Christian's Device for Oil Wells
McDonough's Caloric Engine
Special Notices
Law Applicable to Reissue of Letters Patent
New Publications
Olmsted's Patent Drill Chuck
A Just Measure
Educated Mechanics
A Four-Tool Planer
Free and Easy Legislation on Patents
Patent Claims
Issued from the U. S. Patent Office