22 
Proceedings of the Royal Society of Edinburgh. [Sess. 
tional oscillations superposed on decreasing cyclic field (abscissae) between 
the wide limits of oscillation intensity represented by 1 mm. spark with 
oscillation solenoid No. 1 (three effective turns per cm. of length), and 
10 mm. sparks in series with oscillation solenoid No. 2 (fifteen turns per 
cm. of length). 
The preliminary experiments with the single steel wire '092 cms. diameter 
already mentioned may now be referred to. The oscillations were passed 
directly through the steel wire (transverse oscillations) and also through 
oscillation solenoid No. 2 (co-directional oscillations). In the latter case the 
general results, in so far as carried out, were entirely similar to those 
already described for the bundles of iron wires 0*028 cms. diameter. The 
Table V. — Decreasing Cyclic Field. Co-directional Oscillations. 
1 mm. Spark. Oscillation Solenoid No. 1 . 
Oscillations regarded as superposed upon + H. 
With, secondary oscillation 
connections uncrossed. 
Average. 
With secondary oscillation 
connections crossed. 
H. 
B. 
<— B 
H. 
20 
32 
25 
18 
20 
17*3 
5 
2 
- 1 
17*3 
15-1 
- 1 
- 
2*5 
- 4 
15*1 
11*2 
- 3 
- 
4*5 
- 6 
11*2 
7*8 
- 5 
- 
8 
-11 
7*8 
0 
-14 
-20 
-26 
0 
B -f- 1 *54 = average readings with 
+ H uncrossed connections, and 
- H crossed connections. 
B-pl *54== average readings with 
+ H crossed connections, and 
- H uncrossed connections. 
See broken line curve of fig. VIII. 
magnetic qualities of the wires were also very different in the two cases. It 
may be mentioned that the position of the neutral points indicated strong 
oscillation intensities, while the small galvanometer readings obtained 
showed that the effects of the oscillations were largely confined to the 
surface of the wire. 
