The device according to the main patent comprises, moreover, the following elements: a spirit level 26, as well as a light beam produced by a quartz 8 and a cell 19; a casing 16; an unbreakable glass globe 1; a magnetised needle 23 mounted on a spindle 1 bis, as well as eight circuits emitting the alarm in the event of a break-in, namely 4 and 5 North and South, 20 and 6, 19 and 8, 17 and 12 North and South, East and West. IMAGE
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