MESSRS. A. WALLER AND A. DE WATTEYILLE ON THE INFLUENCE 
Tracings 28-31 show series of contractions by make and break of a galvanic current 
before and after the passage of a galvanic current in the same and in the 
opposite direction for 1 minute. Each series lasts 1 minute. Duration of 
testing current, 1 second; interval, 2 seconds. 
Tracing’. 
Testing 
Resistance 
Number 
Milli- 
Polarising 
Resistance 
Number 
Milli- 
After 
current. 
in circuit. 
of cells. 
webers. 
current. 
in circuit. 
of cells. 
webers. 
effect. 
28 
K.C.C. 
13,000 
70 
3 
An. 
13,000 
150 
9 
Increase 
29 
K.C.C. 
33 
9S 
Kat. 
>> 
)) 
33 
Diminution 
30 
A.C.C. 
8000 
110 
11 
ss 
8000 
110 
11 
Increase 
A.O.C. 
ss 
ss 
ss 
SS 
}} 
33 
Diminution 
31 
A.C.C. 
>> 
SS 
ss 
An. 
ss 
33 
33 
Diminution 
A.O.C. 
>> 
ss 
ss 
>> 
ss 
33 
33 
Increase 
The greater diminution of KC.C. after K.D. than of A.C.C. after A.D. may be 
recognised by comparing Tracings 29 and 31. 
The greater increase of K.C.C. after A.D. than of A.C.C. after A.D. may be 
recognised by comparing Tracings 28 and 30. 
Tracing 31 shows the diminution of A.O.C. 
Tracing 32 shows the effect of the addition of resistance in the secondary circuit on 
the response to the break induction kathode and anode respectively. The first 
group (reading from right to left) is a series of kathodic contractions, the second 
group is a series of anodic contractions without added resistance.. The third 
group is a series of kathodic, the fourth a series of anodic contractions with 
1000 ohms added resistance. The fifth and sixth groups are taken with 2000 
ohms added resistance, the anode group being only just visible. On further 
additional resistance the anode ceased to produce any effect. The seventh 
group is a series of kathodic contractions with 3000 ohms added. The eighth 
group (barely visible) is a series with 4000 ohms. With 5000 ohms the 
kathode ceased to produce any effects. Distance of coil 9 centims. 
Tracing 33 shows the gradual appearance of contraction with the make (kathodic) and 
break (anodic) induction currents of gradually increasing strength. Henry’s 
modification. 
The first four groups of three contractions each are by the anode of the 
break current with the coil at 9’5, 9, 8*5, 8 centims., at which distances the 
kathode of the make produced no effect. The last four groups of six con¬ 
tractions each are by the kathode of the make and by the anode of the break 
at 7*5, 7, 6*5, 6 centims. The first of each pair of contractions is by the 
make current, the second by the break current. The former (kathodic) 
gradually overtakes the latter (anodic). 
