The SciencesNovember 15, 1902
The Core of an Induction Coil
Stories by William A. Del Mar
The SciencesAugust 2, 1902
How to make a Dry Battery
The SciencesJune 21, 1902
The Coherer
How to make, a Modern Coherer and a Brief Review of its History and Theory
The SciencesMay 24, 1902
The Incandescent Electric Lamp–How Manufactured and Tested