Volume 20, Issue 4
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Features
The African Interior
News for Mechanics
M'Master's Patent Clothes Line Holder
West Spruce St. Baptist Church, Philadelphia
The Heaton-Bessemer Correspondence
Manufacturing, Mining, and Railroad Items
Bureau of Naval Engineering--Some Hard Facts
Answers to Correspondents
Emery Wheels--How They Should be Made
Summary of the Velocipede
Increasing the Power of Steam by Superheating
American Beet Root Sugar
Patent Office Contracts
Do Laboring Men Have Time to Study?
The Philosophy of the Oven
Reported for the Scientific American