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CONSTRUCTION OF LOCKS AND KEYS. 7 line with the notches on the ends of the lock, the grooves in the inner rings and the barrel will be also in a line, and the spindle D will slide backwards and forwards. By shutting down the shackle, pushing the end of the lock up close, and turning the rings, the interior flanges prevent the withdrawal of the spindle, until the same letters are again in a line. The spindle is prevented from coming out farther than to admit of the shackle being released, by a small screw, inserted through a hole in one of the inner rings. Fig. 2. LETTER LOCK, Respecting this lock, Vanhagen von Ense, in his Memorabilia, furnishes the following information :¯ Speaking of M. Eegnier, Directeur du Musée d'Artillerie in Paris, he says, " Regnier was a man of some invention, and had taken out a patent for a sort of lock, which made some noise at the time : everybody praised his invention, and bought his locks. These consisted of broad steel rings, four, five, or eight deep, upon each of which the alphabet was engraved; these turned round on a cylinder of steel, and only |
On the Construction of Locks and Keys by John Chubb