1914-15.] Magnetic Quality and Transverse Pressure. 
217 
XXI. — The Magnetic Quality of Iron and Steel as affected by 
Transverse Pressure. By Wm. J. Walker, B.Sc. Communi- 
cated by Professor W. Peddie. 
(MS. received April 14, 1915, Kead June 28, 1915.) 
It has been thought advisable to place the following qualitative results on 
record owing mainly to their general interest and to the unavoidable 
interruption of the experiments. 
The experiments were carried out in order to determine the effect of 
transverse pressure on the magnetic induction in a piece of iron or steel. 
Apparatus Used in the Experiments. 
This is shown in fig. 1. The ballistic method of induction measurement 
was adopted, and the apparatus, from the figure, will be seen to afford 
exceptional facility for the investigation. The cast-iron piece C was made 
a very close fit in the main cast-iron block D. The coil E is placed in the 
gap in this block so that its centre lies in line with the centre of the hole 
in the casting through which the test piece is inserted. It will be seen 
that in this way the necessary condition of endlessness in the iron circuit 
