372 Messrs. Walker and Hatton on the Determination of 

 Glass No. 1. Gravest tone c" f . 







Beats. 



Eevolutions. 



Beats per 

 Revolution. 



Four nodes. 











14 



5-65 



2-48 





14 



5-7 



2-46 





16 



65 



246 





10 



4-0 



2-5 





8 



3-225 



248 





10 



4-0 



2-5 





10 



41 



244 





12 



4-77 



2-52 





11 



4-38 



2-51 





17 



70 



243 









Mean... 2-48 



Six nodes. 











8 



1-65 



4-85 





8 



1-64 



4-88 





8 



1-6 



5-0 





9 



1-87 



4-81 





8 



1-65 



4-85 





8 



1-65 



4-85 





10 



2-08 



4-81 





10 



2-12 



4-72 





10 



21 



4-76 





8 



1-65 



4-85 









Mean... 4-84 



Eight nodes. 











8 



1-08 



7-41 





8 



1-14 



7-01 





8 



1-1 



7-27 





8 



1-13 



7-08 





8 



1-1 



7-27 





8 



112 



7-14 





S 



1-12 



7-14 





8 



1-05 



7-62 





8 



1-08 



7-41 





8 



1-08 



7-41 

 Mean... 7-28 



Number of Nodes. 



Beats per Revolution. 



Difference. 



Theory. 



Experiment. 



4 

 6 



8 



2-4 

 4-8 

 7-005 



248 

 4-84 



7-28 



•08 

 •04 



•275 



