120 Barrerr, Brown, AND Haprrerp—Researches on the 
ST UAVS REV 
Percentage Composition. Baan 
Fe. C. Mn. Ni. Thermal. Electrical. 
Pure Commercial Iron, . ‘ iS © IL | 99-85 | 0:03 | trace — | =301 | 1600 
Manganese Series, . : 5 48 | 99°30 | 0:20] 0°5 —- 21°32 12°14 
- m o © of 44? | O%78 | O94] a0 = 16-08 7:45 
fs in epee ane 39 | 95-64 | 0:36 | 4:0 =o 14:74 6:12 
is » oo o of 1898 || 9446] O18] 84 = 14:38 5:21 
% » oo o off 18883 | GB | 0:26 | 13-0 -- 8°77 2°86 
a Crom eh 4 fp eesleale9 84:64 | 0-15 | 15-2 aes 8:63 2-70 
Nickel Series, . : ; 1397 B 98°65 | 0°26 0:18 0°58 18°54 9°80 
56 9 5 : 6 . 1287 D 97-01 | 0-14 0-72 1:92 18:09 8°56 
- me eT | ITB || OSIA | OLO |] O85! S82! eGo 7°85 
A Boe lol | RBTIK || TSO7 | OL] OO8 | 1O>Ga)  iticiaA 4-49 
5 a 6 : ‘ : 1449 A 67°08 0-70 0-82 | 31°40 6°74 2°04 
Nickel-Manganese Steels, ; 1109D | 80:16} 0-8) | 5:04 | 14:55 5°86 2°09 
is » - «| 1414B | 69:36] 0-60| 5-04 | 25-00 4:39 1:97 
| W. 
Tungsten Series, en 945TH 9 Sym Opn Otel 1:00 19°66 11°63 
Ms - .  .  .| 1294 | 95:94] 0:28] 0:28] 3:50] 19-18 9:80 
” 20 : : : 1294 L 83°46 0:76 0:28 | 15:50 14°87 6°54 
Tungsten-Manganese Steels © . 687 94:10 | 040) 2:25] 3:25 15:08 6°32 
1” 56 a 683 85°23 1 50 3°25 | 10°00 14:55 571 
| Cr. 
Chromium Steels, . ; ; 993 97:10 | 0:90 —— 2°0 15°31 7:25 
| . » oo ao of W177 | S48] 10D] — | S80] Did 4-59 
Omitting the composite alloys, these results are plotted in fig. 2, where 
the abscisse represent the percentage increase of the element added to the iron, 
and the ordinates the respective thermal and electrical conductivities relative to 
copper as 100. These curves show by inspection that the effect of alloying iron 
with another element, even a better conductor, reduces both the thermal and 
electrical conductivity. Compared with copper, the electrical conductivity of 
pure iron and its alloys is throughout lower than their thermal conductivity. It 
will, however, be noticed that the general trend of the curves for any one series 
of alloys is the same thermally and clectrically. That is to say, not only is the 
