Figs. 18A to 22A. Old Scottish treble wooden tumbler lock (Patent Museum).

Fig. 18A. Front view.

Fig. 19A. Side view.

Fig. 20A. Longitudinal section.

Fig. 21A. Transverse section.

Fig.22 A. Section through A B (fig. 21A).

Figs. 23A to 25A. Wooden tumbler lock from Norway (Hazilius Museum, Stockholm).

Fig. 23A. Front view.

Fig. 24A. Longitudinal section.

Fig. 25A. Transverse section on A B.

Figs. 26A to 28A. Wooden tumbler lock made by negroes of Jamaica (Museum, Kew Gardens).

Fig. 26A. Front view.

Fig. 27A. Longitudinal section.

Fig. 28A. Transverse section on A B.

Figs. 29A to 31A. Wooden tumbler lock from British Guiana (Christy Collection).

Fig. 29A. Front view.

Fig. 30A. Longitudinal section.

Fig. 31A. Transverse section.

Fig. 9B. Probable use of fig. 29B, Plate III., as a key for a single tumbler lock.

Figs. 10B to 12B. Modern Egyptian wooden tumbler or pin-lock in use at the present time.

Fig. 10B. Longitudinal section showing pegs raised by key A preparatory to withdrawing the bolt B.

Fig. 11B. Key A.

Fig. 12B. Longitudinal section showing pegs down and bolt locked.