PROCEEDINGS 
X'- 
OF THE 
ROYAL SOCIETY OF EDINBURGH. 
YOL. XXIX. 
1908 - 9 . 
I. — The Shift of the Neutral Points due to Variation of the Intensity 
of Mechanical Vibrations or Electric Oscillations superposed 
upon Cyclic Magnetisation in Iron. By James Russell. 
(Read November 18, 1907. MS. received July 18, 1908.) 
CONTENTS. 
Introduction and Objects of Investigation 
I. Mechanical Vibrations. II. Electric Oscillations. 
Apparatus 
page 
3 
page 
14 
Experimental Methods 
55 
4 
55 
15 
Intensity of Vibrations or 
Oscillations . 
55 
5 
55 
17 
Diagrams .... 
55 
5 
* ’ ' • 55 
17 
Cyclic Field | ^ ata 
5 ’ 
5 
• • • * 55 
17 
l Results 
55 
10 
* * • • 55 
24 
Cyclic Residual ( Data 
'5 
12 } 
Magnetisation \ Results 
5 ) 
12 ) 
• • * * 55 
Results with Cyclic Field 
AND 
Cyclic 
Residual Magnetisation 
IN 
Terms of Field Change .... 
IV. Dr Eccles and Professor Maurain’s Results 
V. Molecular Theory 
Conclusion 
PAGE 
1 
26 
28 
30 
34 
When mechanical vibrations or electric oscillations are superposed at all 
points of a normal hysteresis loop, the induction at the cyclic extremes is 
increased, the residual magnetisation decreased, and those differences of 
magnetic condition to which hysteresis gives rise lessened. The curves 
delineating these changes form a continuous loop, and neutral points 
occur where vibrations superposed upon decreasing cyclic field produce no 
induction change whatever. 
VOL. XXIX. 
1 
