Sorry to be an anorak, but they were fitted with local engines made by Hispano Suiza.
They were used in the film 'The battle of Britain'
Anoraknophobia time.
The origins of the 15, 30, and 40 scores are believed to be medieval French. It is possible that a clock face was used on court, with a quarter move of the hand to indicate a score of 15, 30, and 45. When the hand moved to 60, the game was over. However, in order to ensure that the game could...