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Features

Improved Brick Machine

Lunar Assistance

Observations on the Gold Fields of Venezuela and Geology of the State of Guayana, Read before the Lyceum of Natural History of N. Y.. by R. P. Stevens, Nov. 2D, 1868

Ladenberger's Patent Wagon Brake

Prof. Doremus on the Creation

Tamkin's Automatic Heat Damper

The Best Modes of Testing the Power and Economy of Steam Engines

By Charles E. Emery

Ice Machines

Editorial Summary

Manufacturing, Mining, and Railroad Items

Recent American and Foreign Patents

Answers to Correspondents

Removal of the Broadway Bridge

Poisonous Drugs and Cosmetics

A National Invention Bureau

Facilities for International Communications

Our State Canals--Engineering Suggestions

A Hint to Our Inventors

Annual Rainfall in Different Portions of the Earth

How to have a Cheap Hot Dinner

Patents and Claims

Patent Offices

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November 25, 1868

Complex Causes. Alternative Solutions.