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Evening Star, Issue 15513, 8 June 1914, Page 3

A novel burglar alarm has been placed an the market in Germany composed of a small metal disc, circular in shape, which may easily be carried in the vast pocket. It is so arranged that a detonating- cap may be inserted, and, s-o loaded, it becomes a terror to sneak thieves. Suppose a, traveller is staying in a strange hotel and rinds that he cannot lock his door. He places a chair against the door, and slips the disc under one of its legs. Should anyone attempt to enter the room the chair is forced out of position, the dice flies open and the cap explodes, awakening the sleepe'i The disc may he used under haggage, in purses, under bicycle or automobile tyres, and in many other ways.