Volume 19, Issue 14
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Features
The Origin of Petroleum
Electrical Novelties
The Influence of Scientific Conventions
Barr's Improvement in Centrifugal Machines
Manufacturing, Mining, and Railroad Items
Editorial Summary
New Publications
Answers to Correspondents
Recent American and Foreign Patents
Uniform Standard for Bolts and Nuts-Its Adoption by the Navy Department
Dynamite--Review of a Paper by M. Nobel, the Inventor
Street Dust Laid by the Use of Chemicals
Inquisitiveness-Our Correspondents
The Earthquake Term
Things Easy and Difficult
Patent Office Matters
Coppered Iron Rollers for Calico Printing
The Quality of Illuminating Gas
Official Examination of Applications for Patents
Ventilation
The New Temple Emanuel
Patents and Claims
Isued by the United States Patent Office