550 
MR. G. GORE ON ELECTROTORSION. 
I N. | 
1. 1-5 *-m 
2. 
5. 1-75 -nm 
6. 
9. 2"0 -nm 
10. 
13. 2-2 
14. 
17. 1-75 -nm 
18. 
5)9-20 
Averages 1-84 
5 
1-25 -nm 
3. 3-25 m+ 
1-50 -MK 
/ . 3"25 ^4 
1-50 -nm 
11. 3-5 ^4 
1-50 -nm 
15. 3-25 m+ 
l - 75 -nm 
19. 3 - 3 
)7-50 
5)16-55 
1-50 
3-31 
N. 
4. 2-0 
8. 1-5 ^4 
12. 2-25^*- 
16. 1-0 an. 
20. 1-1 XN- 
5)7-85 
1-57 
The largest torsions were caused by axial currents, and the smallest by coil ones. 
Coil-currents producing a north pole below, succeeding downward axial ones, yielded 
very slightly larger torsions than those succeeding upward ones ; therefore the residual 
effects of downward and upward currents were not widely different : the numbers given 
in Section 27, page 546, agree with this result. 
Second Series. With coil-currents producing a south pole below, the first axial one 
being preceded by a coil one of that direction : — 
1 
S. 
f 
S. 
1. 5*25 mn- 
2. 1-0 
3. 5-0 
4. TO »+ 
5. 6"25 ^4 
6. 1-25 «k 
7. 4-5 4 -m 
8. 1-75^4 
9. 6-0 *4 
10. 1-5 «k 
11. 4-5 4 ^ 
12. 1-5 ^44 
13. 5-83^44 
14. 1-0 4 ^ 
15. 5-25^ 
16. 1*5 m+ 
17. 6-25^4 
18. 1-5 +« 
19. 4-5 
20. 1-25^4 
5)29-58 
5)6-25 
5)23-75 
5)7-00 
Lges 5-91 
1-25 
4-75 
1-40 
The largest torsions were produced by axial currents, and the smallest by coil ones. 
Coil-currents producing a south pole below, succeeding downward axial ones, yielded 
torsions not much larger than those succeeding up ward ones ; this agrees with the 
immediately preceding result obtained with coil-currents producing a north pole. 
In these four series of experiments, axial currents succeeding coil ones which pro- 
duced a south pole below, yielded larger torsions than those which succeeded the oppo- 
site direction of coil-currents, because the influence of terrestrial magnetism strengthened 
a residuary south pole and weakened a residuary north one. The average magnitude 
of all the coil-current torsions was 1-69 mm., and of all the axial-current ones 3-66 mm. 
Comparison of the average numbers in these series of experiments confirms the state- 
ment already made (Section 20, p. 543), that “ the magnitude of the torsion produced 
by a given current depends not only upon the kind of current which immediately 
precedes it, but also upon the description of current which precedes that one. An axial 
current in a given direction succeeding a coil one nearly always produced a greater 
torsion if the coil one was preceded by an axial one in the opposite direction than if it 
