If you wanted to earn a big salary and see the world a hundred years ago, one way of going about it was to become a radio operator.  And one place where you could learn how to do that was just seven blocks away from the White House, at the Service Radio School, 900-2 Pennsylvania Ave. N.W., Washington.  Day and night classes, as well as correspondence classes, were available.  Average daily attendance at the school was 400, from nearly every state in the Union.

This ad for the school appeared a hundred years ago today, in the January 25, 1920, issue of the Washington TImes.