38o Mr. Harvey on the effects oj the density of air 
Experiments with an Eight-day 
box Chronometer, E. 
Mean Pressure 
prior to the 
Experiment 
29.95 inches. 
Pressure during 
the 
Experiment 
half inch. 
Mean Pressure 
after the 
Experiment 
29. 80 inches. 
Daily Rates. 
Daily Rates. 
Daily Rates. 
— 5 4 
if 
— 7-5 
1 1 
P's 
— 5-i 
- 8.7 
-^-7.1 
-s - 6 
— 9-5 
- 5.8 
-5.8 
— 9.2 
- 5.8 
-5-7 
— 9.2 
— 5-» 
“5.6 
4— 9.0 
— 5-9 
“5-2 
— 9.4 
— 6.0 
— 5.1 
— 94 
— 6.6 
— 5-5 
— 9-7 
4-5-0 
_j^5.6 
“9-9 
— 5-7 
— 54 
— 9.9 
— 5-7 
Mean daily rate. 
Mean daily rate. 
Mean daily rate. 
— 5-45 
— 9.32 
— 5.91 
The preceding chronometer having therefore decreased its 
rate in consequence of a diminution of pressure, Contrary to 
the uniform character of the former experiments, I was 
induced to extend my field of investigation ; and for that 
purpose obtained from my naval friends several more 
chronometers. And in order to render the experiments of 
greater utility in their ultimate applications, I decided on 
submitting the time-keepers to the influence of air corres- 
