y» jo 



« 



n 



■ 



9 n, 



2>h /c <m /c 



9a- 10- 



■ o 



97. 



□' At/. . <fs cm.- 

 2- pot:. 



66 



. • *'• -. ' ' * - " » 



Figure 30.— Layout of the wheelwork of a clock made by Bertolla for 



His Excellency Paulo Dona, inscribed "Design No. 1." {Courtesy of Museo 

 Vazionalt della Scitnza e delta Tecnica, Milan.) 



BULLETIN 240: CONTRIBUTIONS FROM THE MUSEUM OF HISTORY AND TECHNOLOGY 



