32 
Table V. 
Absolute 
Atmos- 
pheres. 
0 
1 
2 
3 
4 
5 
6 
7 
8 
9 
7-5 
7-5 
7-5 
7-5 
7-5 
7-5 
7*5 
9-0 
11-0 
seconds 
8 
8-5 
8-5 
8-5 
8-5 
8-5 
8 '5 
10*0 
13-5 
)) 
7 
10-0 
10-0 
10-0 
10-0 
10-0 
11-0 
14-5 
5) 
6 
120 
12-0 
12-0 
12-0 
12-5 
16-0 
5> 
5 
15-0 
15-0 
15-0 
15-5 
20-5 
5 J 
4 
20-0 
20-0 
200 
25-5 
>> 
3 
27-0 
27-0 
31-0 
35 
2 
43-0 
43-0 
33 
1 
97-0 
35 
In this table the first vertical column on the left shows 
the number of atmospheres in the small cylinder from 
which each discharge of 51bs. was made into the receiver. 
The ordinal numbers at the head of the table indicate the 
atmospheres in the receiver when the discharge was made, 
commencing with vacuo; and the time of each discharge, 
in seconds, is shown against the pressure in the discharging 
and receiving cylinders respectively. The times in the 
second and third vertical columns are obtained from those 
in tables I. and IV., when the discharge was made into a 
vacuum and into the atmosphere. On examining these 
results, commencing with the lower pressures, it will be 
seen that for two atmospheres of absolute pressure, the 
time of discharge (43 seconds) was the same for a vacuum 
as it was when made into the atmosphere as has already 
been demonstrated. It will also be seen that a pressure of 
two atmospheres in the receiver acts as a vacuum to four 
atmospheres in the discharging cylinder. This is evident 
from the equality of the time (20 seconds) when the 
discharge was made into one atmosphere or into a vacuum. 
The like ratio will also be observed up to three atmospheres 
in the receiverj which act as a vacuum to the discharge of 
six atmospheres of pressure from the small cylinder. As 
the pressure in the receiver was increased, the diminution 
