Fig. 1. Japanese book fastening derived from the common pin.

Figs. 2 and 3. Common wooden bolt used at Gastein, in Austria, at the present time.

Fig. 2. Front view.

Fig. 3. Transverse section on A B.

a. Handle. b. Bolt. c c. Slit for handle, a.

Figs. 4 and 5. Wooden bolt with pin fastening (supposed form).

Fig. 4. Front view.

Fig. 5. Transverse section on A B.

Figs. 6 to 8. Wooden single tumbler bolt (supposed form).

Fig. 6. Front view (open).

Fig. 7. Front view (closed).

Fig. 8. Transverse section on A B.

Figs. 9A to 11A. Wooden double tumbler lock from the Faroe Islands.

Fig. 9A. Front view.

Fig. 10A. Longitudinal section.

Fig. 11A. Transverse section.

a. Bolt. b b. Teeth of key, c. d d. Tumblers. e e e. Block. f f. Holes in bolt.

Figs. 12A to 17A. Old Scottish wooden tumbler lock (Patent Museum).

Fig. 12A. Front view.

Fig. 13A. Side view.

Fig. 14A. Longitudinal section.

Fig. 15A. Transverse section.

Fig. 16A. Section through A B.

Fig. 17A. Section through C D.

Wyman & Sons, Printers, G^t. Queen S^t. London, W.C.