SA Supplements

May 1891

Volume 31, Issue 804supp

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Features

Mahler's Portrait of Beethoven

Porous Earthenwares

Charles Carroll Gilman

Kaolin

Graham Spencer

Harness Blackings, Polishes, and Waterproof Compositions

Boiler Deposits

Vivian B. Lewes

Harbors, Natural and Artificial

F. H. Cheesewright

Statue-Surmounted Tower with Oscillating Beam, Proposed for the Columbian Exposition of 1893

Oberlin Smith

Rolling Mill Engines

The North German Lloyd Steamer Spree

Henry's Electric Motor Constructed in 1831

J. Elfreth Watkins

On the Corrosion of Iron

Robert Irvine

An Electrostatic Commutator

Rollo Appleyard

Insignia of Officers' Rank in the Navy

The Intensification of Negatives

Automatic Photography

Platinized Glass

Introduction on the General Characters of Mosses

Leo Lesquereux

Egyptian Mummy of a House Dog

Notes on the Later Life History of the Flowering Dogwood (Cornus Florida, L.)

M. Alston Read