987 
Fig. 4 shows the resistance as a function of the field. The obser- 
vations at 77° K. are indicated by a broken line. 
TABLE XXIV: 
Magnetic change in the resistance of iron. 4 
T = 2880 K. T=20°3K. | T=14°5K. 
| (w | 3 Ww | | NW 
Erg OH 1 Oe tod | H Aw Se 104 
| gy X10 py 108 | =p X10 
nT EE 2.8 1500 Hd Td ACR 
Bon 6.8 | 2520 = 2,0 ee 4500 Ed 
2520 Hek + 3150 cee ey 3750... \ coal 
Sane beech iis 4940" «|B 20: |) 40ddi OP eae 
450 of 5.4 || 6110 = 0d io KERS 
Give erase 3. 1260 Ie deer ded 4.053 
| | | 
Hebe elek 0.3 8250 SAN 8250 ke 126 
De 52.1 9065 | + 3.6 9065 + 3.6 
| | | | 
9065 | —4:7 9750 44.6 || 9750 He 47 
10270 1 10270 52 10270 .| “425.4 
e + rer Kl kal 
= Kel F= 238 oa | e= 
zE +4 Fas — Je 4 an _ 
ar en 
{ EE ees OE ne 
A 2000006000," “EO 10400 Gimuss 
_9} Ot | — sg} — aes —— 
7 | (greed Be fei MEE — Ob 
4 | ras X | NTA 
-6 ah Tad J EE ti hal Ce 7 
an ee a 
ee ee) 2 Se LE = Jet 4 
Fig. 4. 
At 288°K the resistance increases in weak fields, and decreases 
in fields greater than 7000, This is in agreement with results obtained 
by L. GRUNMACH and F. Werpert'), C. W. Heap’) and others. At 
liquid hydrogen temperatures this behaviour is reversed, for the 
resistance diminishes in weaker fields and increases when H> 7000. 
There is a neutral zone at about H = 7000. 
1) L. Grunmacn and F. Weipert: Verh. d. Deutsch. Physik. Ges. 1906, 359. 
2) C. W. Heap: l.c. 
