The blackout first started on the 1st of September 1939 before the declaration of war. It required you to cover your windows and light sources up, so the Germans could not see your house so the Germans could not bomb your house.
They covered the bike lights so the Germans didn’t see the light to bomb there. It made you a lot safer and they were used a lot for World War 2. It was simply easy to put them on . You just screwed them on with the cover protecting the bulb . Bicycle, motor bike and car light covers were used in the war to stop German planes from knowing that there was a town or village nearby. These were used on cars and bicycles when out on the road.
In World War Two, Air Raid Wardens had a helmet (below) that would partly protect them from bombs. Air Raid Wardens would go around to each of the people in their area the middle of an Air Raid and make sure they had blackouts up.
The WW2 stretcher was used for carrying injured citizens, like a modern day ambulance. A stretcher bearer is someone who carried the stretcher. Two people normally carried the stretcher. It was normally used in war, natural disasters or injuries.
Dr Hugh Owen Thomas (1834–1891) invented the stretcher.
A stretcher would be carried by a bearer and a medic who would then provide treatment to the wounded soldier. A stretcher was made out of cotton, wood, steel and brass. This would make it very sturdy and durable. Many stretchers remain today. This would allow the soldiers to be carried faster, especially with a soldier on, which would make it quicker to carry them to a medic in a hospital.