Improvement in Sulky Harrows, Lighting Mines with Gas

Agricultural Engineering

Double Ratchet Brace

Ancient and Modern Industries of the Chinese

The Tanite Solid Emery Wheel

Manufacture of Indian Ink

From the Mechanics' Magazine.

Improved Open Fire Grate

The Barracuda

The Egyptian Fellah

Our Splendid Engraving

Ludlow's Sliding Stop Valves for Steam, Water, and Gas

Improved Lever Escapement

The Scientific American in 1869

Is Water Necessary to Mitigate the Effects of Dry Air from Heating Furnaces?

Tin--Where and How It Is Obtained

The Steam Engine Trials at the American Institute Exhibition

A Peculiar Feature of Agricultural Invention

Ancient Modes of Extinguishing Fires

Wanted--Better Sidewalks

On Cotton Seed and Cotton Seed Oil

Slate Pencils

Recent American and Foreign Patents- January 29, 1870

Under this heading we shall publish weekly, notes of some of the more prominent home and foreign patents.

United States Circuit Court--Southern District before Judge Blatchford

Applications for Extension of Patents- January 29, 1870

Official List of Patents- January 29, 1870

Issued by the United States Patent Office. For the week ending Jan. 18, 1870. Reported Officially for the Scientific American.

Answers to Correspondents- January 29, 1870