On the Development and Distribution of Primitive Locks and Keys

by Augustus Henry Lane-Fox Pitt-Rivers

Fig. 13B. Longitudinal section showing pegs raised by key A preparatory to withdrawing the bolt B.

Fig. 14B. Longitudinal section showing pegs down and bolt locked.

Figs. 15B to 20B. Reproduction of Roman tumbler lock (Mainz Museum) (Lindenschmit).

Fig. 15B. Front view.

Fig. 16B. Longitudinal section.

Fig. 17B. Transverse section on C D.

Fig. 18B. Section through A B.

Fig. 19B. Bolt (top view).

Fig. 20B. Key.

a. Key. b. Bolt. c. Block, e. Hasp. f f. Tumblers. g. Spring. h. Plate of spring.