A device used to assist in the judging of fencing matches.
Titles read: "The tell-tale light!"
Various shots of a fencing match between two players in white suits and helmets. We see a contraption that is wired to the fencers and the handles of their swords; this tells who has hit who and when, and assists in the judging of fencing competitions.
The device is demonstrated in a short match between Mr Pelling, British Fencing Champion (left), and Mr Childs, the former champion. A man stands beside the machine and calls the points.