The SciencesOctober 1, 1925
Checking the Magnetic Permeability of Iron
A New Method for the Quick Testing of Cores and Wire for Radio and Other Apparatus
Stories by Paul B. Findley
EnvironmentJune 1, 1925
Making the Air Tell Tales on itself
Recently Perfected Devices Which Keep a Record of the Moisture in the Air
TechnologyApril 1, 1925
Electric Filters that Illustrate Defects of Radio Loudspeakers