The SciencesOctober 25, 1919
Better Concrete—I
Motion Picture Studies of Existing Conditions; Suggested Improvements
Stories by Nathan C. Johnson
The SciencesNovember 16, 1912
Welding Extensions on Small Drills, Workshop Notes
The SciencesSeptember 7, 1912
Making Models of the Magnetic Field
Fixing the Iron Filings With Plaster of Paris
The SciencesAugust 17, 1912
The Permeagraph
A Graphical Machine for the Magnetic Testing of Iron and Steel