“The beginning of the long dash, followed by 10 seconds of silence, indicates exactly 1 o’clock Eastern daylight time.”

Millions of Canadians grew accustomed to hearing a version of this daily affirmation on CBC Radio One. The National Research Council Time Signal, and the series of 800 Hz “pips” that preceded and followed the time-setting dash, worked its way into everyday rituals. Human listeners, and automated radio receivers at railways, shipping firms, and other entities, could set their mechanical clocks to it. That is why it started broadcasting on November 5, 1939, one year into Canada’s entry into World War II.