Technology
Stories by George M. Hopkins
The Sciences
A Simple Camera Shutter
The Sciences
How to Make a Storage Battery
The Sciences
How to Make a Simple Electric Motor
The Sciences
Microscopic Notes
The Sciences
Eight Light Dynamo
Technology
The Gyroscope
The Sciences
Polarized Light
Health
Microscopic Examination of Ciliated Organisms by Intermittent Light
The Sciences
Simple Holtz Machine and Experiments in Static Electricity
The Sciences
How to make a Telescope
Technology
Apparatus for Combining Rectangular Vibrations
The Sciences
How to make a Working Telephone
Technology
Electrical Indicator for Showing the Rotation of the Earth
The Sciences
