This ad for both magazines was on the back of the Experimenter's Guide #2, for Radio-Phone Receivers. Both issues shown are July, 1922 issues, and this ad probably appeared a couple of months past July.
This ad for both magazines was on the back of the Experimenter's Guide #2, for Radio-Phone Receivers. Both issues shown are July, 1922 issues, and this ad probably appeared a couple of months past July.