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SA Supplements Vol 25 Issue 639supp

SA Supplements

Volume 25, Issue 639supp

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Features

One Thousand Ton Hydraulic Shearing Machine

Woodite

Heating Cities by Steam

Charles E. Emery

The Locks of the Panama Canal

Gas Fired Steam Boilers

Carey Lea's Photochloride of Silver

William Lang

An Automatic Intermittent Siphon

Methods of Teaching and Learning Modern Languages

Charles F. Kroeh

The Chinese Wall a Fact

J. H. Roberts

Notes on Ethereal Oils

Influence of Magnetism upon Crystallization

C. Decharme

Underground Haulage by Electricity

Experimental Optics

A New Antiseptic

The Shone Hydro-Pneumatic System of Sewerage

God's Universe

The Saturnia Maia Moth

Building Plans and Specifications

The Girod Cosmograph

Ancient Microscopes

Hair Tonic

Departments

Patents - March 31, 1888