MR. G-. GORE ON ELECTROTORSION. 
551 
followed one in the same direction. A similar but less general result occurs with coil- 
currents succeeding axial ones.” Thus : — 
mm. mm. mm. 
i 
N. 
t gave 
1-55, 
whereas 
| N. 
t 
gave 
1-84= 
•29 increase. 
f 
N. 
1 » 
2-98, 
55 
i n. 
1 
55 
3-31 = 
•33 
55 
l 
S. 
1 » 
5-05, 
55 
f s. 
t 
55 
5-91 = 
•86 
55 
f 
S. 
1 » 
3-91, 
55 
1 S. 
f 
„ 
4-75 = 
•84 
55 
N. 
1 
N. „ 
1-57, 
55 
S. 1 
N. 
55 
3-27= 
1-70 
55 
N. 
1 
N. „ 
1-50, 
55 
s. t 
N. 
55 
3-25 = 
1-75 
55 
S. 
I 
s. „ 
1-40, 
„ 
N. | 
S. 
55 
-2 — 
1-20 
decrease. 
S. 
t 
s. „ 
1-25, 
„ 
N- t 
S. 
55 
1*1 = 
: -15 
55 
The exceptions only occur with south-pole coil-currents succeeding axial ones (see 
Section 20, p. 542). 
As several of the different orders of succession of currents produced torsions in the 
same directions, attempts were made, but unsuccessfully, to accumulate the torsions 
produced by each. 
31. Which current most determines the direction of torsion X 
The symmetry of all the torsional movements in the four immediately preceding 
series becomes conspicuous on classing the right-hand ones in the order of their relative 
magnitudes, and arranging the left-hand ones similarly ; thus : — 
| S. J-4-75-M* 
| S. | — 3 - 91 -nm 
S. | N. — 3’25 
| N. | — 1-84 
| N. | — T55-HS8 
N. | N.-I-50-hk 
S. | S. — 1-40 
N. | S.- -20 -mk 
| S. | -5-91 an- 
| s. | —5-05 bh- 
S. | N. — 3-27^ 
| N. | -3*31*^ 
f N. | -2-98^+ 
N. | N.-1-57 *h- 
S. | S. -1-25-mk* 
N. | S. -TIO^h- 
As in each combination of three currents in the foregoing Table (except the two which 
produce torsions in an apparently abnormal direction) the first current may be omitted 
without altering the direction of torsion f, it is evident that the direction of torsion 
depends upon one or both of the remaining two ; and as each combination of currents 
in the right-hand column would then differ from the corresponding one of the left-hand 
column only in having its axial current in a reverse direction, it is probably the axial 
current which most determines the direction of torsion. It is, of course, possible so to 
arrange the different members of the Table that each member of the right-hand column 
* Those marked * are apparently abnormal in direction (see Section 32). 
t The first current of the three in those cases affects only the magnitude of the torsion. 
