42 PROFESSOR C. G. KNOTT ON MAGNETIZATION 
of the various resistances and of the quantities referred to above are given when the 
temperatures of L are about 15°, 180°, 300°. 
Resistances when the Temperatures 
of L are | 
Branches. | 
15° 180° 300° 
3 62 6°2 6:2 
| G 173 1°73 1:73 
Ly 3°12 6 10 
M 3°04 5 8 
r 3°24 3:24 3°24 
be 3:16 2°7 2°6 
D 571-2 1009-9 2058°6 
AD/dxr &8°8 126°4 2344 
dD/dL 89°9 96°4 141°7 
In the calibration experiments the slight change in the resistance of \ was always 
effected by putting in a resistance of 30 ohms in multiple are with a small part of » 
whose resistance was 0°5125. That is to say, the change dd was a decrease of 0°008603 
ohms, and dd/A = — 0:002655. 
Returning now to equation (1), namely, 
=(ip=Me : ; aay 
we get, in consequence of the small change dd, the equation 
Ddi+idD = — Meda . ie 
Similarly, when by application of the magnetizing field L is changed to L+0L, we find 
D&+i8D = + posh. > e) 
Substituting for 7 its value as given in (1) we get for (2) and (3) 
Dadi 
Ly- MA zu 
D 
Ee -MA aby 
~ edd (M + | 
Ue eee . ie 
J 
Dodi 
4 aL (m - 
If, at the beginning of the experiments corresponding to equations (2) and (3), the 
bridge were accurately balanced, the current 7 would vanish and we should have 
; di_ Maa Li dd 
Se REeSIE 
or 
dl __ 8 dn (5) 
: ae . 
This was the case in many instances, and in many others the value of 2 was so 
small as to make (Lw—M)) less than the thousandth part of Lu or MA. Under these 
