the velocity of sound , made in Holland . 
441 
SECTION V. 
Rate of Clocks with conical Pendulums. 
Having shown in the preceding section how the distance 
between the two stations was ascertained, we must now pro- 
ceed to show that the clocks with conical pendulums, with 
which the interval of time between the light and the report 
was measured, kept a regular rate ; for this purpose they 
were frequently compared on each station with the box chro- 
nometers. The following table shows how many decimal 
seconds and fractions of seconds passed on the conical centri- 
fugal pendulum clock in five minutes of the marine box 
chronometer. This is the centrifugal clock on the station of 
Zevenboompjes. 
3 L 
MDCCCXXIV. 
