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The Duplicity of a Lyræ

Experiments on Vortices

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

By C. V. Zenger

The Florida Phosphate Deposits

By N. H. Darton

The Cryolite Mine of Greenland


Witch Hazels

Fires—How to Prevent and how to Stop Them

Gaseous Illuminants

By Vivian B. Lewes

Apparatus for Taking Distances at Sea

Peculiarities of Leather

Plain Photographs Projected in Colors

Photography in the Colors of Nature

By F. E. Ives

Electric Motive Power on Elevated Railways

By William Nelson Smith

A Practical Electric Railway Conduit

By Stephen D. Field

An Efficient Plating Dynamo

By Geo. M. Hopkins

Photographers' Eyesight

The Magnetic Telegraph—Dr. Green's Interesting Speech

The Power of Water, or Hydraulics Simplified

By G. D. Hiscox

On the Composition of Butter

By P. Vieth

Polarization without a Polarizer

Cost of Steel Making in Spain

A Curious Formation of the Element Silicon

By H. N. Warren


  • Departments

    Patents- March 14, 1891

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