POAVEE  OF  METALS  AND  ALLOYS  TO  CONDUCT  HEAT. 
359 
of  a more  uniform  composition,  and  prevent,  especially  in  copper  and  tin  alloys,  the 
formation  of  various  crystalline  compounds  having  ditferent  compositions. 
The  description  of  the  physical  appearance  of  these  alloys  will  be  given  in  a paper. on 
then.’  hardness. 
The  tu’st  class  of  alloys  which  we  shall  describe,  are  those  which  conduct  heat  in  the 
ratio  of  the  conductibility  of  the  metals  composing  them.  This  class  is  represented  by 
the  alloys  of  tin  and  lead,  and  tin  and  zinc. 
Formula  of  the  alloys 
Found 
Calculated. 
Silver 
= 1000. 
and  per-centage. 
(Mean). 
Found. 
Calculated. 
3Sn  = 73-97 
lPb=26-03  j 
12-28 
12-30 
385 
386 
4Sn  =69-44 
lFb=  30-56 
12-17 
12-14 
381 
381 
3Sii  =63-01 
1 Pb  = 36-99  J 
11-96 
11-86 
375 
372 
2Sn  =53-18 
lPb  = 46-82J 
11-16 
11-16 
350 
350 
lSn=  36-22] 
1 Pb=  63-78  J 
10-52 
10-72 
230 
236 
lSn=22-ll  1 
2Pb=77-89 
10-00 
10-11 
313 
317 
lSn  = 15-911 
3Pb  = 84-09 
9-91 
9-85 
311 
309 
lSn  = 12-44' 
4Pb=87-36j 
9-60 
9-69 
301 
304 
iSn  = 10-20] 
5Pb=89-80 
9-55 
9-60 
299 
301 
Tin  and  Zinc. 
Formula  of  the 
alloys,  and 
per-centage. 
Tempera- 
ture of  the 
50  cub. 
cent,  before 
beginning. 
Temperature  of  the 
50  cub.  cent,  after 
15  minutes,  from 
5 to  5 minutes. 
Conducti 
bility 
found. 
Mean. 
Calculated. 
Silver 
Found. 
= 1000. 
Calculated. 
5Zn  = 73-43] 
r 17-0 
24-9 
30-3 
34-2 
17‘2 
1 
17-25 
1 8-'25 
541 
1 
572 
1 Sn  = 26-57 
17-0 
24-7 
30-2 
34-3 
17-3 
4Zn  = 68-86 
r 16-4 
24-3 
30-5 
34-7 
18-3 
1 
18-3 
17-99 
574 
564 
lSn  = 31-14 
r 
16-0 
24-1 
30-0 
343 
18-3 
[ 
3Zn  = 62-43 
1 
117-6 
25-3 
30-5 
34-4 
16-8 
16-9 
17-57 
530 
551 
lSn  = 37-57 
r 
16-7 
24-5 
29-9 
33-7 
17-0  . 
2Zn  = 531]  ] 
r 18-5 
26-4 
31-5 
35-2 
16-7 
16-65 
16-95 
522 
532 
lSn  = 46-89 
17-5 
24-9 
30-3 
34-1 
16-6 
lZn  = 35-6l 
1 
18-1 
25-5 
30-5 
34-1 
16-0  1 
16-00 
15-80 
501 
495 
lSn  = 64-39 
r 
17-4 
24-6 
29-8 
33-4 
16-0 
lZn  = 21-65 
J 
17-1 
23  8 
28-7 
32-3 
15-2  ] 
1 
15-15 
14-90 
475 
467 
2Sn  = 78-35 
r 
16-6 
23-3 
28-2 
21-7 
15-1 
lZn  = 15-55] 
17-5 
24-3 
28-9 
32-2 
14-7  1 
14-6 
14-39 
458 
451 
3Sn  = 84-45  J 
f* 
17-6 
24-4 
28-9 
32-1 
14-5 
lZn  = 12-14  ] 
J 
r 17-3 
23-8 
28-7 
32-0 
14-7  ] 
14-6 
14-25 
457 
447 
4Sn  = 87-86 
17-5 
23-8 
28-8 
32-0 
14-5 
lZn=  9-95  1 
ri7-i 
2.3-6 
28-4 
31-7 
14-6  ] 
1 
14-55 
14-10 
456 
442 
5Sn  = 90-05/ 
L17-0 
23-4 
28-2 
31-5 
14-5  J 
f 
3 c 
MDCCCLVni. 
