528 
MR. F. GOTCH ON THE ELECTROMOTIVE PROPERTIES 
Five Groves in Primary Coil. 
Secondary coil, 12 centims. ( + ) G. without shunt 
55 55 
55 5 
55 5 > 
11 
55 55 55 55 
, 10 „ 
9 „ 
55 55 55 
55 55 55 55 55 55 55 
55 55 55 
} 15” readings. 
Deflections. 
0 
+ 65 "j 
+ 15 > 15" readings. 
0 
+ 105 : 
+ 40 
0 
+ 90 ; 
+ 35 
0 
+ 350' 
+ 180 
+ 120 1- 15" readings. 
+ 90 ’ 
+ 85 
15” readings. 
The galvanometer circuit was now closed, and opened alternate 15' 
Closure. 
Deflections. 
8 cm. ( + ). 
•003"-15" 
+ 550 
Interval during which the galvanometer 
circuit was broken. 
. , 
Galvanometer circuit re-closed. 
30"-45" 
+ no 
„ ,, broken. 
. # 
„ ,, re-closed. 
60”-75" 
+ 50 
,, ,, broken. 
. , 
, , 
,, ,, re-closed. 
90"-105” 
+ 5 
7 cm. ( + ). 
1”-15" 
+ CO 
30”-45" 
+ 300 
60”-95" 
+ 180 
90”-105" 
+ 125 
. 
120"-135" 
+ 95 
5 cm. ( + ) G. . 
, , 
270 
5 5 . 
. , 
+ 160 
15” readings 
. 
+ 108 
55 . 
, , 
+ 70 
55 . 
, , 
+ 55 
55 . 
. . 
35 
0(+) G.*. 
1"—15" 
+ CO 
30”-45” 
4- 240 
60"-75" 
+ no 
90”-105” 
+ 60 
55. 
120"-135” 
+ 40 
The effect, when small in amount, lasts only 30" ; it increases in amount as the 
induction shock increases in intensity, and, when very large, lasts over 2'. The same 
is true of the effects produced by the passage of (—) induction shocks of different 
intensity, but in this case a stronger induction shock must be used to secure the 
production of the effect than is necessary when (+) induction shocks are employed. 
