Figure 34. — Dial plate of a brass lantern clock made by 

 Bertolla at the age of 80. {Courtesy of Museo Nazionale 

 delta Scienza e della Tecnica, Milan.) 



Figure 35. — Movement of brass lantern 

 clock produced by Bertolla at the age of 80, 

 showing details of movement and double 

 bell. (Courtesy of Museo Nazionale della Scienza 

 e della Tecnica, Milan.) 



index. The weight-driven clock strikes the hours and 

 quarters on two bells with a single hammer. The 

 chapter ring, which is soldered to the dial plate, is 

 marked for the minutes on the outer rim and for the 

 four quarters inside it. Over the center of it, is a 

 semicircular opening in the dial plate through which 

 is visible a revolving disk attached behind the dial 

 plate. This disk is marked with the hours and 

 revolves from right to left, the current hour being 

 indicated by a projection from the minute ring. The 

 brass dial plate is engraved with simple floral designs 



in the corners and around the broken arch. There 

 is no comparison between this crude and simple 

 decoration and the extremely fine quality of the 

 engraving on the dial plate of the Borghesi clock, 

 for instance. In the center of the dial plate is engraved 

 the following: 



"Questo orologio l'idcai e lo feci nella mia avanzata 



eta d'anni 80. Bart Am Bertolla" 

 (I designed and made this clock at my advanced age of 



80 years. Bartolomeo Antonio Bertolla.) 



70 



Bl I I I TIN 240: CONTRIBUTIONS FROM THE MUSEUM OF HISTORY AND TECHNOLOGY 



