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Scientific American Magazine Vol 39 Issue 3

Scientific American Magazine

Volume 39, Issue 3

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Features

Improved Variable Automatic Cut-off

Working Gold Ores

The Uses of Mechanism

The Sun

S. P. Langley

Professor Edison's New Carbon Rheostat

The Chase Elemental Governor

Communications - July 20, 1878

The Electrical Indicator For Showing The Rotation Of The Earth.-A Note From Prof, Mayer.
To the Editor of the Scientific American :

Improved Step Box

Improved Piston Rod Stuffing Box

Improved Automatic Fan

Wood Carver of Simla

Astronomical Notes - July 20, 1878

Berlin H. Wright

The Phonograph

Apparatus for Administering Medicine to Horses

A Boat Older Than the Ark

The Otto Bicycle

A Simple Gas Generator

Departments

Notes and Queries - July 20, 1878

Index of Inventions - July 20, 1878

Business and Personal - July 20, 1878