SA Supplements Vol 31 Issue 797supp

SA Supplements

Volume 31, Issue 797supp

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Features

Pyrogravure

Iodine as a Detective

Cinereine

Associated Journalism

Paul Wilcox

A Perpetual Calendar

R. W. Mcfarland

“Nickel-In-The-Slot” Machines

W. L. Aughinbaugh

Some Recent Warship Designs for the American Navy

J. H. Biles

Removal of Earth of by Means of Scrapers

Electrical Units of the Present and Future

Francis B. Crocker

The Black Knot of Plum and Cherry Trees

Byron D. Halsted

Recent Discoveries at Thebes

Jubilee of the Chemical Society of London

Presentation of Addresses

Building Plans and Specifications

Useful Engineering Books

The Peach Yellows

Departments

Patents- April 11, 1891