SA Supplements

March 1891

Volume 31, Issue 793supp

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Features

Experiments on Vortices

The Duplicity of a Lyræ

The Revolution of the Planets Produced by the Electrodynamic Action of the Sun

C. V. Zenger

The Florida Phosphate Deposits

N. H. Darton

The Cryolite Mine of Greenland

Lomarias

Witch Hazels

Fires—How to Prevent and how to Stop Them

Gaseous Illuminants

Vivian B. Lewes

Peculiarities of Leather

Apparatus for Taking Distances at Sea

Photography in the Colors of Nature

F. E. Ives

Plain Photographs Projected in Colors

Electric Motive Power on Elevated Railways

William Nelson Smith

A Practical Electric Railway Conduit

Stephen D. Field

An Efficient Plating Dynamo

Geo. M. Hopkins

Photographers' Eyesight

The Magnetic Telegraph—Dr. Green's Interesting Speech

The Power of Water, or Hydraulics Simplified

G. D. Hiscox

On the Composition of Butter

P. Vieth

Polarization without a Polarizer

A Curious Formation of the Element Silicon

H. N. Warren