“5. The application of a dog operated on by the cap or detector-tumbler for holding the bolt.
“6. The application of a dog for the purpose of holding the internal slide or tumbler.
“7. The application to locks of curtains or rings, turning and working eccentrically to the motion of the key, for preventing access to the internal parts of the lock.
“8. The application to locks of a safety-plug or yielding-plate, at the back of the chamber formed by such eccentric revolving curtain or ring.
“9. The application to locks of a strong metallic wall or plate, for the purpose of separating the safety and other parts of the lock from each other, and preventing access to such parts by means of the key-hole.
“10. The application to locks of a cap or detective tumbler, for the purpose of closing the key-hole as the key is turned.
“11. The constructing a key by a combination of bits or movable pieces, with tongues fitted into a groove and held by a screw.
“12. The constructing a key having a groove in its shank to receive the detector tumbler.”
fig. 46. Movable stump.