274 Mr. T. G. Bunt's Pendulum Experiinents. 



The results obtained from this pendulum were as follows :— 



My shortest and lightest pendulum had a length of 8 feet 3 

 inches, and a ball of 4^ lbs. The mean arc of vibration given 

 to this pendulum was longer than in the two former cases, and 

 the ellipticities greater. The experiments are accordingly col- 

 lected into eight groups, according to the different values of b, 

 and give the following results : — o 



b= +0-0125 inch. Motion per hour 13-70 

 00375 ... ... 13-23 



00605 ... ... 14-13 



0-1050 ... ... 14-63 



Z,= -0-0155 ... ... 10-73 



00400 ... ... 10-70 



00635 ... ... 8-79 



0-0850 ... ... 9-32 



Mean value of a about 1-2 inch. 



Mean of all. 



Each of these three pendulums, like those with which my 

 experiments were performed last year, had its two nodal lines 

 of azimuths placed at right angles to one another, on arriving at 



