44 3 
the velocity of sound, made in Holland. 
Thus, in 445 sexagesimal minutes by the box chro- 
nometer of Zevenboompjes, the index of the centrifugal 
clock of the same station made 30986,83 turns, and thus 
one sexagesimal minute on the chronometer was equal to 
69", 6 3 decimal seconds of the conical pendulum clock. The 
table shows that the conical pendulum clock, during the 
course of the experiments, did not alter its rate with respect 
of the chronometer. The comparisons between the clock 
and the chronometer were made at various times of the day, 
and immediately before and after the experiments. 
At the other station of Zevenboompjes, the box chro- 
nometer and conical pendulum clock were frequently com- 
pared before, during, and after the experiments. The fol- 
lowing table shows that the accuracy of the conical pen- 
dulum clock was quite sufficient for the purpose in view. 
A Table of comparison , showing how many decimal seconds the 
conical pendulum clock of the station of Kooltjesberg beat in one 
sexagesimal minute by a chronometer . 
Sexagesimal 
minute. 
Decimal 
seconds. 
Sexagesimal 
minute. 
Decimal 
seconds. 
/ 
// 
/ 
// 
1 
69,33 
1 
69,39 
1 
69 , 44 
69,68 
69,35 
69,56 
69,64 
69,22 
69,38 
69 , 44 
69,78 
69,45 
69,38 
69,23 
69,44 
69,47 
69,22 
69,70 
69,30 
69,38 
69,32 
