This 1950 video instructs the public on how to dial a rotary telephone. Before many years had passed, most of the public became fully adept at dialing rotary telephone dials. Rotary dials eventually were replaced, almost entirely, with “touch tone” systems, in which one presses buttons rather than dialing a dial. Were rotary dials to make a comeback, the this instructional video might again be needed:
(Thanks to investigator David Weinberger for bringing this to our attention.)