PROFESSOR GRAHAM ON THE MOTION OF GASES. 
607 
Table XXII. — Transpiration by Capillary H (with cupped ends) into a six-pint jar. 
Barom. 29’39. Temp. 51°. 
Gauge barometer in inches. 
Nitrogen. : Oxygen. 
Olefiant gas. 
Air. 
Carburetted hydrogen. 
I. 
II. I. 
II. 
I. 
II. 
i. 
II. 
I. 
II. 
III. 
IV. 
" // 
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// 
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// 
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// 
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28-5 
0 
0 0 
0 
0 
0 
0 
0 
0 
0 
0 
0 
26-5 
203 
204 233 
235 
122 
121 
211 
211 
129 
129 
129 
129 
24-5 
206 
207 236 
236 
122 
122 
212 
212 
129 
131 
130 
130 
23-5 
104 
104 121 
120 
62 
63 
108 
108 
67 
66 
66 
66 
From 28-5 to 23-5 inches 
513 
515 590 
591 
306 
306 
531 
531 
325 
326 
325 
325 
Mean Results. 
Gauge barometer. 
Nitrogen. 
Olefiant gas. 
Air. 
Carburetted hydrogen. 
From 28-5 to 23*5 inches. < 
’ Time in seconds ... 
Time of oxygen = 1 
514 
0-8704 
306 
0-5182 
531 
0-9000 
325-25 
0-5512 
For the experiments of the preceding table the form of the capillary H was so far 
altered, that a funnel-form was given to the apertures of the tube. This was done 
by softening the tube in the blowpipe flame, within an inch of each extremity, and 
expanding the bore into a small ball of about one tenth of an inch in diameter; the 
ball was afterwards cut across the middle, and left the tube of course with a cup- 
shaped termination. This change in the condition of the capillary seems to have 
no effect on the comparative rates of transpiration of the different gases. 
It was found that the passage of air became a little slower by cupping the end of 
the tube by which the gas obtains ingress, in the proportion of 509 to 496 ; but cup- 
ping the point of egress occasioned no further change in the rate, the experiments 
being made within the pressures of 28‘5 and 23’5 inches. 
The transpiration rate of olefiant gas differs entirely from that of nitrogen and car- 
bonic oxide, of which gases it possesses the theoretical specific gravity, and is a great 
deal more rapid; the transpiration coefficient being so low as 0\5182. The specific 
gravity of the gas made use of was found to be (T9840, and it was absorbed by the 
perchloride of antimony to the extent of 96’5 per cent. The determination of the 
true coefficient for this gas is attended with unusual difficulty, from its constant and 
I believe unavoidable impurity, as prepared by the action of sulphuric acid upon 
alcohol. 
