Irina Bogdanova. Measure of being (№ 459222)

- The metronome is knocking. This is so that the population knows that the radio is working. You can’t have an announcer on duty 24/7; they also need to sleep. In Leningrad it is forbidden to turn off the radio in order to notify people in time about the air raid warning. Slowly knocking means all clear, but fast knocking means the residents should run to the bomb shelter.