748 
PROFESSOR, 0. REYNOLDS ON CERTAIN DIMENSIONAL 
Meerschaum plate No. 3. 
25. A fresh meerschaum plate, - 44 inch thick, was therefore tried, another diffusio- 
meter, exactly similar to the original one, being constructed for the purpose. 
Table YIII.—Thermal transpiration of air by meerschaum plate No. 3 (’44 inch or 
1D2 millims. thick). Temperature of steam, 212° F. or 100° C.; temperature of 
water, 63° F. or 17° C. 
Mean pressure by vacuum 
Difference of pressure by 
siphon gauge. 
Ratio of 
mean pressure to 
difference of 
pressure. 
Log of mean 
Log of 
difference of 
gauge. 
May 11. 
May 14. 
pressure. 
pressure. 
inches. 
31-00 
millims. 
787-4 
inch. 
•2200 
inch. 
millims. 
5-588 
141 
2-49-1 
2-342-3 
29-50 
749-3 
•2140 
5-436 
138 
2-47 
2-330 
28-50 
723-9 
•2160 
5-486 
132 
2-45 
2-334 
27-50 
698-5 
, , 
•2126 
5-400 
129 
2-44 
2-327 
24-50 
622-3 
•2100 
5-334 
116 
2-37 
2-322 
23-00 
584-2 
•2130 
5-410 
108 
2-36 
2-328 
21-50 
546-1 
•2054 
5-217 
104 
2-33 
2-312 
20-00 
508-0 
•2120 
5-385 
94 
2-30 
2-326 
19-50 
495"3 
•1970 
5-003 
99 
2-29 
2-294 
18-00 
457-2 
•2100 
5-334 
85 
2-25 
2-322 
17-00 
431-8 
■1890 
4-800 
90 
2-23 
2-276 
12-50 
317"5 
•1730 
4-394 
72 
2-09 
2-238 
11-50 
292-1 
■1630 
4-140 
70 
2-06 
2-212 
8-25 
209-5 
■1446 
3-672 
57 
1-92 
2-160 
7-80 
198-1 
•1336 
3-393 
59 
1-89 
2-105 
5-20 
133-3 
■1184 
3-007 
44 
1-72 
2-073 
4-70 
118-4 
•1050 
2-667 
1-672 
2-021 
3-40 
86’4 
•0904 
2-290 
37 
1-531 
1-954 
3-10 
78-7 
•0806 
2-047 
38 
1-491 
1-906 
2T0 
53-3 
•0710 
1-803 
29 
1-322 
1-851 
2-00 
50-8 
•0630 
1-604 
32 
1-301 
1-799 
1-40 
35-6 
•0510 
1-294 
27 
1-146 
1-707 
1-32 
33-5 
•0486 
1-234 
1-120 
1-687 
1-10 
28-0 
•0394 
1-000 
28 
1-041 
1595 
0-83 
21-06 
•0380 
0-965 
22 
0-919 
1-580 
0-65 
16-51 
•0304 
0-762 
21 
0-812 
1-482 
0-52 
13-21 
•0290 
0-736 
18 
0-716 
1-462 
0-40 
10-16 
•0250 
, . 
0-635 
16 
0-544 
1-392 
0-39 
9-91 
•0220 
0-559 
17 
0-531 
1-342 
0-28 
7-11 
•0192 
0-488 
14 
0-361 
1-283 
•0180 
0-457 
14 
0-361 
1-255 
0-20 
5-08 
"0168 
0-427 
12 
0-301 
1-225 
0-19 
4-82 
•0146 
0-371 
12 
0-278 
1-164 
0-15 
3-81 
•0154 
0-391 
10 
0-176 
1-187 
