Hannahs' Patent Metropolitan Railway, Precautions in Using Wire Rope

Solutions for Silver Plating

The Sea-Horse

The Cochineal Insect and Its Allies

G. K. Proctor's Improved Treadle Motion

Mitchell & Kessinger's Improved Flour Bolt

Improved Turbine Water Wheel

Pipes for Domestic Water Service

The Blowpipe as an Aid to the Drill in Opening Safes

The Erie Canal

Health in Old Age

Important Decision by the Commissioner of Patents

Scientific Intelligence- May 13, 1871

On a Method of Determining the Percentage of Water Mechanically Suspended in Steam Delivered from Boilers which Prime

Inventions Made by Workmen--Who Owns Them?

Refuse and Waste

Important Decision of the Commissioner of Patents--Trade Mark Patents

Answers to Correspondents- May 13, 1871

Recent American and Foreign Patents- May 13, 1871

Applications for Extension of Patents- May 13, 1871

Official List of Patents- May 13, 1871

Issued by the U. S. Patent Office

Queries- May 13, 1871