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12 CONSTRUCTION OF LOCKS AND KEYS. wards towards A B, &c., to any determined distance, and, when each of them has exactly received its due motion, the bar G is set at liberty, so as to slide backwards and forwards as required. Now, in order to determine the separate and distinct motion that shall be given to each, we will suppose the part H to be made; which part serves to represent a key, and the ends 1 2 3 4 5 6 are cut of different lengths, either by rule, or by chance, so that, when pushed against the ends of the sliders at I I, they will cause each of them to be slided up at different times, and to different distances, from I I, in a form exactly correspondent to the ends of the part H. When they have thus received their correspondent position, and their ends at I | form a complete tally with the part H, by making a notch in each slider at 1 2 3 &c., in a line with the bar G, the said bar will then have liberty to be slided backwards and forwards without obstruction; and, when brought into its original situation, and the part H withdrawn, the sliders, A B C> &c., will then fall down into their notches, and fasten it as usual; their ends at 1 I will be restored perfectly even, as before, and not the least trace be left, of the position required in them to set the bar G at liberty." Fig. 5. BRAMAH'S LOCK. " A is a frame, or barrel that moves the bolt by its turning, in which barrel, or frame are fixed eight, or any other given number of |
On the Construction of Locks and Keys by John Chubb