Acccunt of some Expe-rhncnts o?i Friction. I2i 



- E, a slight axis made of a wire, perhaps the tenth of au 

 inch diameter, turning with the spindle, and attached 

 by a socket to the avbur of the seconds-hand of a com- 

 mon clock movement (not shown in the figure), so 

 that every turn of the stone corresponded to a minute 

 on the dial-plate, which was so situated as to be easily- 

 observed. 

 The expernnenfs were conducted as follows : By a verv 

 ejxelient watch (having a detached scapement) 1 was ena- 

 bled to call out at the expiration of every minute, and my 

 assistant being at his post, opposite the dial-plate of the 

 clotk, noted the hour and minute pointed out by it at the 

 instant of my calling; and, that as little time might be lost 

 as possible, we were both ready to observe as soon as the 

 stone was detached from the mill. 



Below are stated the particulars of three experiments, 

 being all that were made. 



First Experiment 



Second Experiment. , Third Experiment. 



