160 
adapted to the size of the bulb. A cut showing the bottle 
and finger pump is given. 
For very bad air smaller bulbs were shewn, such as were 
recommended for workshops, mines, &c. ; a convenient size 
for common life is here given : — 
No. of Strokes of 
the Finger Pump, 
or No. of BaUfulls 
of Air. 
Per cent, of Carbonic 
Acid indicated in 
the Air. 
Actual Amount of i 
Carbonic Acid in the 1 
Air of the Ball. 
1 
6-0 
Grammes. 
0-2515 
2 
30 
01257 
3 
20 
0-0838 
4 
1-5 
0-0629 
5 
1-2 
0.0503 
6 
10 
0-0419 
7 
0.8 
00359 
8 
0-75 
0-0316 
9 
0*66 
00279 
10 
0056 
00251 
11 
0054 
00229 
12 
0-0499 
0-0209 
13 
0-0460 
00193 | 
14 
0-0428 
0-0180 
15 
00399 
00167 
| 
