Improved Variable Automatic Cut-off

Working Gold Ores

The Uses of Mechanism

The Sun

The Chase Elemental Governor

Professor Edison's New Carbon Rheostat

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 Piston Rod Stuffing Box

Improved Step Box

Improved Automatic Fan

Wood Carver of Simla

Astronomical Notes - July 20, 1878

The Phonograph

Apparatus for Administering Medicine to Horses

A Boat Older Than the Ark

A Simple Gas Generator

The Otto Bicycle