20 Annals of the Carnegie Museum. 



50. Watch of vari-colored gold. The mechanism is visible through a 

 crystal plate at the back of the case; beautifully made hands 

 set with jewels. Made by vS. Triboulet, Geneva, A. D. 1760. 

 (Diameter 45, thickness 23 mm.) 



(Plate XVII, fig. I.) 



51. Gold pair-case watch; the outer case repousse, classical design, 

 with an ornamental border of green, blue, and white enamel. 

 The dial is elaborately carved and discloses a calendar. Dutch 

 manufacture, though signed "Smiht (sic) London." Made 

 about 1760. (Diameter 50, thickness 25 mm.) 



(Plate XVH, fig. 2.) 



52. Pinchbeck^* watch; pierced and engraved case. Made by John 

 Cock, of London, about the year 1760. (Diameter 47, thick- 

 ness 33 mm.) 



(Plate XVII, fig. 3.) 



53. Silver watch with a pierced and engraved dial. The back of the 

 case is pierced and ornamented with five repousse scenes from 

 the legend of William Tell. Designed for use in a sedan-chair. 

 Made by Philiph Votter, of Vienna, in the year 1763. (Diam- 

 eter 95, thickness 55 mm.) 



(Plate XVIII.) 



" Pinchbeck was a favorite material for the manufacture of watch-cases. It is 

 composed of an alloy, three parts zinc to four of copper. It took its name from the 

 inventor, Charles Pinchbeck (1670-1732). The secret of this composition was 

 jealously guarded by the inventor and his descendants for manj' years. 



