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Features

Hon. Benjamin F. Tracy, Secretary of the Navy

Masonry Bridges with Semi-Free Joints

H. M. First-Class Cruiser Gibraltar

The Construction of Race Courses

By F. B. krause

Detecting Water in Petroleum Tanks

The Technology of the Paper Trade

Electric Meters, Motors, and Money Matters

By W. E. Ayrton

Apparatus for Examining the Cavities of the Face by Electric Light

The Electric Organ of the Raia Torpedo

Protection of Telephone Lines against Induction

By Dollivo Von Dobrowollsky

The Blended Tocci Brothers, of Locana, Italy

By Robert P. Harris

The Tocci Twins

Crystallography

Soiree of the Royal Society

A Century of American Weeds

Their Root Systems Tabulated

By Byron D. Halsted

Musk Seeds

Protea Nana

Death Watches

Useful Engineering Books

Patents!

Departments

  • The Scientific American Supplement. Index for Vol.33

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June 25, 1892

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