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Features

Report of the Director of the Central Park Museum, 1878

A Sailing Railway Car

Every Man His Own Keely Motor

The Intensity of Telephonic Sounds

Progress at the Patent Office

How Fast Can You Think?

Color Blindness

Sea Water as a Beverage

Slotting Machine

Improved Circulating Generator for Steam Boilers

Improved Sewer Gas Check Valve for Stationary Wash Basins, Etc

Communications

Improved Nut Lock

Some New Workshop Appliances

Centrifugal Pumping Engine

New Investigations on Gallium

Improved Dovetailing Machine

The Victoria Regia

Redier's New Registering Thermometer

Astronomical Notes

By Berlin H. Wright

The Philadelphia Lawn Mowers

The Horn Bug

By C. V. Riley

Communications Received

The Scientific American

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April 20, 1878

See the World from a Different Perspective

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