PROFESSOR W. C. ROBERTS-AUSTEN ON THE DIFFUSION OF METALS. 395 
Table B.—Tube 2. Gold in Lead. 
1 
Number 
of section 
of diffu¬ 
sion tube. 
2 
Weight in grammes 
of metal from each 
section— 
3 
Per¬ 
centage of 
gold in 
each 
section. 
4 
Corrected 
for 
density to 
equal 
volumes. 
5 
Divided 
by 
0-0054785. 
6 
Theoretical numbers 
for— 
7 
h 
ZV~kt 
(by inter¬ 
polation). 
lead-gold 
alloy. 
gold. 
Jl n-l° 
^ n.ij 
2 \/ kt 
/--U 14. 
2 \/kt 
1 
2-44 
0-1855 
7-603 
7-887 
1440 
1427 
1530 
0-1313 
2 
3-72 
0-2768 
7-442 
7-717 
1408 
1381 
1474 
0-1329 
3 
364 
02529 
6-948 
7-186 
1312 
1295 
1369 
0-1321 
4 
3-35 
0-2111 
6-302 
6-500 
1187 
1176 
1225 
0-1322 
5 
3-50 
0-1931 
5"518 
5-666 
1034 
1035 
1056 
6 
354 
0-1688 
4-769 
4-879 
891 
882 
878 
7 
3-20 
0-1242 
3-882 
3-954 
722 
728 
706 
0-1327 
8 
3-36 
0-1050 
3125 
3-170 
579 
585 
544 
0-1315 
9 
3-8o 
0-0928 
2-411 
2-439 
445 
475 
407 
0-1324 
10 
3-79 
0-0691 
1-823 
1-839 
336 
352 
298 
0-1330 
11 
3-29 
0-0451 
1-371 
1-379 
252 
272 
217 
0-1338 
12 
317 
00349 
1-101 
1107 
202 
218 
163 
0-1330 
13 
2-99 
0-0313 
1-047 
1-062 
194 
191 
136 
Sum. . 
54-785 
Mean . 
0-1325 
h = P194 centims. cold = 1‘225 centims. at 492° C., therefoi-e kt = 21 - 37. 
t = 6'96 days, therefore k = 3’07 sq. centims. per diem. 
