PROPERTIES OF MATTER IN THE GASEOUS STATE. 
755 
Table XII. —Thermal transpiration of air by stucco plate No. 2 ( - 25 inch or 6'35 
millhns. thick). Temperature of steam, 212° F. or 100° C.; temperature of water, 
70° F. or 21° C. 
Mean pressure by vacuum 
Difference of pressure by siphon gauge. 
Ratio of 
mean pressure to 
Log of mean 
Log of 
difference of 
pressure. 
gauge. 
July 17. 
July 18. 
difference of 
pressure. 
pressure. 
inches. 
30-25 
millims. 
768-3 
inch. 
•0160 
inch. 
millim. 
•406 
1892 
2-480-1 
1-204-3 
30-05 
763"3 
•0162 
•411 
1855 
2-477 
1-209 
28-05 
712-4 
"0166 
•422 
1710 
2-448 
1-220 
27-25 
692-1 
•0170 
•432 
1600 
2-435 
1-230 
25-85 
656 6 
•0176 
•447 
1470 
2-412 
1-245 
24-90 
632-4 
•0180 
•457 
1383 
2-396 
1-255 
23-15 
588 
•0196 
•498 
1181 
2"364 
1-292 
22-05 
560 
•0194 
•492 
1137 
2-343 
1-287 
20-30 
515-6 
•0208 
■528 
976 
2-307 
1-318 
19-20 
487"4 
•0204 
•518 
946 
2-283 
1-309 
18-00 
457-2 
■0230 
•584 
784 
2-255 
1-361 
16-10 
408-94 
•0240 
•610 
670 
2-207 
1-380 
15-8 
401-32 
•0230 
•584 
680 
2-199 
1-361 
14-0 
355-6 
•0254 
•645 
551 
2-146 
1-404 
13-80 
350-52 
•0244 
•620 
565 
2-140 
1-387 
12-45 
316-2 
•0266 
•676 
453 
2-095 
1-425 
11-85 
301-00 
*0256 
"650 
462 
2-073 
1-408 
10-82 
274-8 
•0276 
•701 
391 
2-034 
1-440 
10-05 
255-2 
•0262 
•660 
383 
2-002 
1-418 
9-80 
248-9 
•0282 
•716 
348 
1-991 
1-450 
9-10 
231-1 
•0272 
•691 
334 
1-959 
1-434 
8-75 
222-1 
•0284 
•721 
308 
1-942 
P453 
8-10 
205-7 
•0280 
•711 
290 
1-908 
1-447 
7-65 
194-3 
•0290 
"736 
264 
1-883 
1-462 
715 
181-6 
•0284 
•721 
252 
1-853 
1-453 
6-72 
170-7 
•0294 
'746 
229 
1-817 
1-468 
6-20 
157’5 
•0288 
•731 
215 
1-791 
1-459 
5-50 
139-7 
•0290 
•746 
190 
1-740 
1-462 
5-25 
1333 
. , 
•0286 
•726 
183 
1-720 
1-456 
4-40 
111-7 
•0280 
•711 
157 
1-643 
1-447 
4-30 
109-2 
■0276 
•701 
156 
1-633 
1-440 
3-40 
86"4 
•0266 
"676 
128 
1-531 
1-422 
3-35 
85-1 
•0264 
•671 
127 
1-525 
1-421 
2-70 
68-6 
■0242 
•615 
112 
1-431 
1-381 
2-40 
60-96 
•0226 
•574 
106 
1-380 
1-354 
2-00 
50-8 
•0214 
•543 
93 
1-301 
1-330 
1-45 
36-8 
■0182 
■462 
80 
1-161 
1-266 
1-22 
31-00 
•0176 
•447 
70 
1 086 
1-245 
•80 
20-82 
•0138 
•350 
58 
0-903 
1-139 
•50 
12-70 
•0108 
•274 
48 
0-699 
1 033 
•38 
9-65 
•0088 
•223 
42 
0-580 
0-944 
•225 
5-71 
•0050 
•127 
45 
0-352 
0-699 
