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SA Supplements Vol 21 Issue 547supp

SA Supplements

Volume 21, Issue 547supp

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Features

Gavoy's Optical Signaling Apparatus

Recent Improvements Introduced into the Manufacture of Gas

Bridge over the Dnieper

On a New Sulphureted Hydrogen Gas Apparatus

John J. Barlow

The Institution of Naval Architects

The Japanese Ironclad Naniwa

A New Device for Subaqueous Foundations

Roll Turning Lathe

The Hydra-Headed Rail

Wrought–Iron Water Pipes

Hamilton Smith

Prof. Joseph Henry and the Magnetic Telegraph

Edward N. Dickerson

An Absolute Electrometer Giving Continuous Indications

MM. E. Bichat, R. Blondlot

Baron Paul Shilling

The Royal Society Soiree

The New Invention of the Messrs. Bell

Carbonic Acid as a Fire Extinguisher