396 PROFESSOR W. C. ROBERTS-AUSTER ON THE DIFFUSION OF METALS. 
Table C.—Tube 3. Platinum in Lead. 
1 
Number 
of section 
of diffu¬ 
sion tube. 
2 
Weight in grammes 
of metal from each 
section— 
3 
Per¬ 
centage of 
platinum 
in each 
section. 
4 
Corrected 
for 
density to 
equal 
volumes. 
5 
Divided 
by 
0-0048654. 
6 
Theoretical numbers 
for— 
7 
h 
2 Vkt 
(by inter¬ 
polation). 
lead 
platinum 
alloy. 
platinum. 
h o-u 
2 vrr' J ' 19 - 
2 Vkt 
1 
311 
0-2805 
9-020 
9 744 
2003 
1927 
2023 
0-188 
2 
337 
0-2845 
8-442 
9-076 
1865 
1817 
1895 
0-186 
3 
3-40 
0-2527 
7-434 
7-925 
1629 
1614 
1664 
0-183 
4 
3-68 
0-2265 
6-155 
6-492 
1334 
1352 
1368 
5 
3-67 
0-1850 
5-041 
5-268 
1083 
1067 
1054 
6 
3-94 
0-1383 
3-510 
3-619 
744 
793 
760 
0-194 
7 
3-84 
0-0933 
2-430 
2-482 
510 
556 
513 
0-190 
8 
3-32 
0-0530 
1-596 
1-618 
332 
368 
324 
0-188 
9 
3-98 
0-0404 
1-015 
1-024 
210 
230 
193 
0-185 
10 
3-65 
0-0216 
0-592 
0-595 
122 
137 
108 
0-185 
11 
3-16 
0-0132 
0-418 
0-420 
86 
83 
60 
0-179 
12 
4-33 
0-0169 
0-390 
0-391 
80 
57 
39 
Sum. 
48-654 
Mean . 
0-186 
1 
h — P245 centims. cold = 1'277 centims. at 492°, therefore kt = 11‘79. 
t = 6'96 days, therefore k = 1'69 sq. centims. per diem. 
