"Black-Out Tonight Is At..." WW2 ARP Warden Sets The Clock

This often reproduced image shows a warden from Kingston is London setting the time that the black-out would commence that evening. The 'clock' is probably outside the warden's post. Black-out times were half-ab hour after sunset and half-an-hour before sunrise.

"Black-Out Tonight Is At..." WW2 ARP Warden Sets The Clock