Plate I

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

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

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

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

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

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).