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Description: | none MANU unsigned circa 1960 DES after CHUBB,Jeremiah. 1818 Portsmouth, Hampshire, England. This is a striker plate for s large lever tumbler action mortice lock with a snib and deadlock i.e. the snib lock can be operated without the key and can be seen at the bottom of the forend. With the key action; the first turn operates a small livelock , seen at the top of the forend, the second turn operates the large deadlock that can be seen at the centre of the forend. The return spring is exposed at the back of the lock. Although the locking mechanism is obscured it is a Chubb detector type probably with five double acting detainers. This type of lock has detector that at the time of its invention 1818, prevented the lock from being picked. To pick a lock each of the tumblers are normally moved one at a time, the detector registers the first movement and locks the entire mechanism until the real key is inserted. In 1851 an American, Alfred Charles Hobbs (1812-1891) finally managed to pick a Chubb lock at the Great Ehibition. | License: | http://www.hmag.gla.ac.uk/spirit/rights/ | Publisher: | Hunterian Museum and Art Gallery, University of Glasgow | Rights holder: | Hunterian Museum and Art Gallery, University of Glasgow | Subjects: | SCIENTIFIC COLLECTION : | Source: | Hunterian Museum | Creator: | Hunterian Museum and Art Gallery, University of Glasgow | Identifier: | http://www.huntsearch.gla.ac.uk/cgi-bin/... | Language: | en-GB | Go to resource |
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