The SciencesMarch 31, 1906
A Simple Camera Shutter
Stories by George M. Hopkins
The SciencesMarch 10, 1906
A Convenient Camera
The SciencesJanuary 20, 1906
Unscientific and Scientific Divining Rods
The SciencesJanuary 6, 1906
An Electric Chime
The SciencesDecember 2, 1905
The Demagnetization of Watches
The SciencesOctober 7, 1905
Making Carbon Rods and Plates
TechnologyFebruary 21, 1903
Recording Telegraph for Amateurs
TechnologyDecember 27, 1902
Spectral Photography
The SciencesSeptember 6, 1902
Correspondence - September 6, 1902
TechnologyAugust 30, 1902
Some Modifications of the Normal Photograph
The SciencesFebruary 15, 1902
Home-Made Electric Night Lamp
The SciencesNovember 16, 1901
A Few Meteorological Instruments
TechnologyJanuary 19, 1901
VII. Simple Hygroscope
The SciencesDecember 29, 1900
VI. A Metallic Thermometer
TechnologyDecember 22, 1900
V. An Inexpensive Water Motor
TechnologyDecember 15, 1900
IV. Simple Electric Motor
TechnologyDecember 8, 1900
III. Simple Electric Motor
TechnologyNovember 24, 1900
II. The Electric Chime
TechnologyNovember 17, 1900
A Home-Made Steam Engine
The SciencesDecember 26, 1896
Hand Feed Electric Lamp for Lanterns
TechnologyJanuary 11, 1896
Electric Igniters for Gas Engines
The SciencesMarch 30, 1895
A Simple Camera Shutter
The SciencesMarch 12, 1892
How to Make a Storage Battery
The SciencesApril 14, 1888
How to Make a Simple Electric Motor