MESSRS. A. WALLER AND A. DE WATTEVILLE ON THE INFLUENCE 
break induction current (with the exception of statement 9, which we did not 
attempt to verify). 
Using the following abbreviations, 
F— for the effect of the kathode of the induction current (make or break). 
„ „ anode „ ,, 
G— for polarisation by the galvanic kathode. 
G+ „ „ „ anode. 
the above results may be summed up thus :— 
Tracings: 
(1) >F+. 
(2) F— with G— >F—.14, 20 
(3) F+withG-f- >F+. 19 
(4) F- with G+ <F—.17, 18, 136 
(5) F+ with G— .13a, 16 
(6) Increase of F— with G— > Increase of F+ with G+ . . 19 to 22 
(7) Diminution of F— with G+ > Diminution of F+ with G— . 23and24 
(8) F-f- with increasing G— is at first diminished, then increased to 
above normal.. 13a 
(9) F— with increasing G+ is at first diminished, then begins to 
increase . 136 
(10) The increase from minimum F+ with G— occurs with weaker 
G than that from minimum F— with G+. With further 
increase of G it is greater in the cas,e of F+ with G— thaD 
in that of F— with G+. 13a, 6 
For convenience of reference we have given with each of the above statements a 
number referring to an illustrative figure. 
C. Minimum exciting strength of an induction current with increasing strength of a 
polarising current. 
The following tables contain numbers expressing in millimetres the distance of the 
secondary coil at which contractions were first marked on the cylinder in the absence 
of polarisation, and in the presence of polarisation by 10 and 20 cells respectively. 
