Properties of an Extensive Series of Alloys of Iron. 3 
SMAIBILID, IL, 
Non-MaAGNeETIC AND NEARLY Non-Maanetic STExExzs. 
Magnetising Force 320 C.G.S. 
ae ] = | 
| 
| Intensity of | 
Mark. Chemical Composition. | ae | 
of 320. 
1388 Fe, 86:74; C, 0:26; Mn,13:0,. . . . 65 
1010 Iie, OSV 9 C, IMs Win, IO, . »o oo 6 123 
| » Wi | ‘ " mn ; : : 5 0 
1379 D | Fe, 84°64; C, 0°15; Mn, 15:2, . : : : 0 
30 | Tio, CBOSs G, leGe Nin, 15M, . . o - | 82 
598 | Ma, @@8e CG, hte Min, 1%, . » ee 
1424 Fe, 76°58 ; C, 0°83; Mn, 5:9; Ni, 14:44; Cu, 2°25, | 20 
1109 | Fe, 80°16; C, 0-8; Mn, 5:04; Ni, 14°55, . 3 
| oo — Whit, | se + <i 55 0 
| 1414 A | Fe, 75°36; ©, 0:6; Mn, 5:04; Ni, 19, . . | 16 
| s — Win, | 5 AS * n ; ; 3 
| 14148 Fe, 69°36; C, 0-6; Mn, 5:04; Ni, 25, .  . | 7 
| ., * = 5 5 
1339 | Fe, 88:22; ©, 1-21; Mn, 8 ; Ni, 2°57, 7 
1313 | Fe, 79°35; ©, 1-4; Mn, 10:25; Ni,9, °. 49 
1348.4 | Fe, 84-71; C, 1-34; Mn, 11-1; W, 2:85, . .| 30 
eB | Ie, SEB s Ch IOs Wha, WOws Wyo Bilal, : 5 
620 | Fe, 78:12); C, 0°88; Mn, 17-5; Cr, 3°5, . : 46 | 
| 
The first thing that strikes one in this table is the remarkable effect produced by 
comparatively small quantities of another element alloyed with iron in destroying 
or altering the magnetic susceptibility of the latter: 13 per cent. of manganese 
added to iron destroys the magnetic character of the iron ; the steel thus produced is, 
for all practical purposes, as inert to magnetism as zinc or stone. Still more striking 
is this effectin composite alloys of iron; nickel-steel is strongly magnetic, even an 
alloy of iron with 14, 19, or 25 per cent. of nickel is fairly magnetic, but add 
) per cent. of manganese to any of these high percentage nickel-steels and they 
become non-magnetic, albeit, a 5 per cent. manganese-steel is very fairly 
magnetic, as shown in our previous paper. Again, an 8 per cent. manganese-steel 
has a considerable intensity of magnetisation even in much lower fields than 320 
units, but add 24 per cent. of nickel to this manganese-steel and it becomes non- 
magnetic; and yet in itself a 24 per cent. nickel-steel is almost as magnetic as 
B2 
