I 14 BULLETIN OF THE LABORATORIES 
H in my study the value .19707 c. g. s. units. Of course the value is 
always modified by the presence of iron, and I could not eliminate 
errors resulting from that. 
The following from my results of Mar. 28 will help to illustrate 
the method used : 
SIDE ON. 
Magnet 
Mar 
Tan. 2a 
Tan. a 
1 
r 
T 
W 
H 
A 
28 
19*5 
1000 
.00975 
5 
35 
4.16 
.8765 gr. 
.1989 
B 
28 
20. 125 
I coo 
.01007 
5 
35 
4.08 
.8682 gr. 
.1963 
C 
28 
13-875 
1000 
.00694 
5 
35 
4.706 
.8745 gr. 
.1987 
D 
28 
1975 
1000 
.00988 
5 
35 
4.285 
9255 
•1953 
For further explanation the student is referred to Mr. Gray’s book. 
I make no claim to originality. I have only followed as nearly as 
possibile the directions given there. I have been so pleased with the 
method that I have thought others might be induced to try it. 
*The symbol Pi is represented by il throughout. 
