Tase II. 
MANGANESE SERIES. 
Physical Properties of an Extensive Series of Alloys of Iron. 115 
| 
Relative Gondknet tinh. 
Mark. Principal Constituents. Th L2. Tee nie 
B 99-71 Ee, 15-0 225-0 100-0 100-0 
48 99°30 Fe; 0°50 Mn, 13-8 190-4 84-6 15:5 
4147 98-76 Fe; 1:00 Mn, 124 153°8 68-3 46-4 | 
53 97°34 Fe; 2:25 Mn, 11-7 136-9 60-8 874 | 
| ® 94-53 Fe; 5°15 Mn, 10:6 112-4 50-0 29°2 
| 18283 | 94:46 Fe; 5-40 Mn, 10°7 114-5 50°8 B24 
1338 86-74 Fe; 13-00 Mn, 8:3 68-9 30°6 17°8 
1379 84:64 Fe; 15:20 Mn, 8-4 70-6 31:3 16°8 
These results are plotted in 
the curves shown in fig. 1, p. 118. The rapid 
drop in conductivity for the first small increments of manganese occurs also with 
carbon, and is true of both thermal and electric conductivity. 
The next table gives the results with some of the nickel steels. Unfortunately 
the specimens, though purer than ordinary nickel steels, contained a considerable 
amount of manganese, which impurity, as just remarked, seriously impairs the 
conductivity. A given percentage of nickel alloyed with iron has far less effect 
in reducing both the thermal and electrical conductivity of iron than the same 
percentage of manganese or carbon. 
These results are shown plotted in fig. 1. 
Tas_eE III. 
NICKEL SERIES. 
Relative Conductivity, 
Mark. Principal Constituents. L. L?. These. Hloeteieall 
B 99°71 Fe, 15-0 225 100-0 100-0 
1397 B 98°65 Fe; 0°58 Ni, . 13:3 177 78:8 61:0 
1287 D 97:00 Fe; 1:92 Ni; 0°72 Mn, 12°5 157 69:8 53-2 
1287E 95:14 Fe; 3:82 Ni; 0°65 Mn, 11'8 139 61:8 45:6 
1287 I 87:28 Fe; 11:39 Ni; 0:93 Mn, 9:0 81 36:0 30:5 
| 1287K 78:97 Fe; 19:64 Ni; 0:93 Mn, 9:0 81 36:0 27-9 
1287 L | 74:03 Fe; 24:51 Ni; 1:00 Mn, 7:8 61 MIO | MEI 
1449A | 67:08 Fe; 31:40 Ni; 0°82 Mn, 7-2 52 23°1 12:7 
