Figs. 21C and 22C. Portions of Roman padlock found at Jordan Hill, Weymouth.

Fig. 21C. Side view of lock-case and parallel bar.

Fig. 22C. Side view of bolt with spring catch. a. Bolt. b b. Perpendicular bars of bolt c c. Rings to slip over parallel bar d. e. Catch springs. f. Hole in tube through which bolt is passed. g. Key.

Figs. 23C to 25C. Roman padlocks found at Great Chesterford, Essex ('ArchÆological Journal').

Fig. 23C. Side view of supposed original form.

Fig. 24C. Improved form showing bolt, a.

Fig. 25C. Improved form without bolt.

Figs. 26C and 27C. Old Swedish padlock.

Fig. 26C. Longitudinal section.

Fig. 27C. Side view of bolt and springs. d. Parallel bar turning on hinge at h, and entering tube case at j.

Figs. 28C to 30C. Old Russian bronze padlock, St. Petersburg ('La Ferronnerie').

Fig. 28C. Side view of bolt and springs.

Fig. 29C. Side view of tube case.

Fig. 30C. End of case showing aperture for springs.

Figs. 31C and 32C. Old English fetterlock, from Epping, near London.

Fig. 31C. Longitudinal section.

Fig. 32C. Side view of bolt and springs A. Side and end views of key shown above.

Fig. 33C. Fragment of bolt with springs, found in rampart in excavations at the Norman Camp, Folkestone ('ArchÆologia').

Fig. 34C. Iron padlock found at Swanscombe, Kent, 15th Century ('ArchÆological Journal').

Fig. 35C. Longitudinal section (with key) of modern padlock, from Rushmore, Wiltshire, spiral spring action.

Fig. 36C. Side view of modern padlock, from Paris, spiral spring action.

Fig. 37C. Side view of modern padlock, from Germany, with spiral spring action.

Fig. 38C. Longitudinal section of modern handcuff, from Wiltshire, with spiral spring action, unlocked by a revolving key.