PROFESSOR GRAHAM ON THE MOTION OF GASES. 
611 
Mean Results. 
Gauge barometer. 
Carburetted hydrogen. 
From 28 to 20 inches < 
f Time in seconds 
Time of oxygen =1... 
151 
0-5521 
From 20 to 12 inches • 
' Time in seconds 
186 
Time of oxygen = 1... 
0-5519 
From 12 to 8 inches < 
Time in seconds 
Time of oxygen = 1... 
129-5 
0-5475 
From 8 to 4 inches * 
Time in seconds 
Time of oxygen=l... 
210-5 
0-5482 
From 4 to 2 inches - 
f Time in seconds 
213-5 
Time of oxygen=l... 
0-5398 
From 28 to 4 inches < 
f Time in seconds 
Time of oxygen=l... 
677 
0-5500 
The coefficient obtained for carburetted hydrogen in the preceding experiments 
never varies much from 055, which is the mean between 28 and 4 inches. The re- 
sult is similar to that given bv glass capillary H for the same gas. 
Table XXVII. — Transpiration by Copper Capillary into a two-pint jar. Barom. 2949. 
Temp. 56 0, 5. 
Gauge barometer in 
inches. 
Air. 
Oxygen. 
Nitrogen. 
Carbonic oxide. 
Air. 
Hydrogen. 
I. 
II. 
I. 
II. 
I. 
II. 
I. 
II. 
III. 
I. 
II. 
// 
// 
// 
// 
// 
// 
// 
// 
// 
28 
0 
0 
0 
0 
0 
0 
0 
0 
0 
0 
0 
20 
421 
419 
467 
466 
405 
407 
405 
404 
419 
206 
205 
12 
515 
514 
572 
574 
501 
500 
496 
498 
516 
255 
254 
8 
360 
363 
402 
404 
351 
351 
348 
348 
361 
179 
179 
From 28 to 8 inches... 
1296 
1296 
1441 
1444 
1257 
1258 
1249 
1250 
1296 
640 
638 
Mean Results. 
Gauge barometer. 
Air. 
Nitrogen. 
Carbonic oxide. 
Hydrogen. 
From 28 to 20 inches ■ 
From 20 to 12 inches - 
From 12 to 8 inches < 
f Time in seconds 
Time of oxygen^l... 
I" Time in seconds 
Time of oxygen = 1... 
r Time in seconds 
Time of oxygen =1... 
420 
0-9003 
514-5 
0-8979 
361-5 
0-8970 
406 
0-8703 
500-5 
0-8734 
351 
0-8709 
404-5 
0-8670 
497 
0-8673 
348 
0-8635 
205-5 
0-4405 
254-5 
0-4441 
179 
0-4441 
From 28 to 8 inches 
f Time in seconds 
Time of oxygen =1... 
1296 
0-8984 
1257*5 
0-8717 
1249-5 
0-8662 
639 
0-4429 
The great resemblance which these results bear to those of the last glass capillary 
is most surprising. The rates of air, nitrogen, carbonic oxide and hydrogen, may be 
considered as identical with these two capillaries, although they differ in substance, 
and also in the time of passage, which is slower in the copper capillary than in H, in 
4 k 2 
