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Features

Improvement in Hand-Power Sawing Machines

Electrical Novelties

The Origin of Petroleum

The Influence of Scientific Conventions

Barr's Improvement in Centrifugal Machines

Editorial Summary

Manufacturing, Mining, and Railroad Items

New Publications

Answers to Correspondents

Recent American and Foreign Patents

Dynamite--Review of a Paper by M. Nobel, the Inventor

Uniform Standard for Bolts and Nuts-Its Adoption by the Navy Department

Inquisitiveness-Our Correspondents

Things Easy and Difficult

The Earthquake Term

Street Dust Laid by the Use of Chemicals

Official Examination of Applications for Patents

Coppered Iron Rollers for Calico Printing

The Quality of Illuminating Gas

Patent Office Matters

Patents and Claims

Isued by the United States Patent Office

Ventilation

The New Temple Emanuel

Patents

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    Correspondence

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September 30, 1868

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