30 
A pair of charts can 
72° azimuth settings a 
M. M. SLOTNICK 
readily be made for each instrument when used in 
nd another pair for 120° azimuth settings. The 
charts appended were made for field use for a Bamberg instrument of the 


ORO 
BERS 

SRD 
CHART Bi: U, ANDGx 
120° TTING 
ROI 

A, ; 
PKI DORR 
RRR RRB 
SAK 

SKN 
SENS \2 


4, 
xy 
ne 
Se 


C2 
EEE 
oo 
OK 
% 




OP 
OS 











POLLS 
SP 
KS 
g 
a 
XL 
ae 
iS 
5K. 
Ko 
a: 
wee 
On 
ae 
os 
AD 
SARONC. 
Sx 
a 
6 
KOS 
= ‘ SRK 
RRR 

Wap 


a 
BER 
Se 
BD 
gis 
Ze 
a 
Lr 
es 
ON 
SSRIS 
i 
PS 
v 
SD 
‘5 
a 










Zo 
Sx 
KS 
o> 
OK 
ON 
(2 
% 
ie 
SOA 
> 
TAK 
Os 
x 
IKKE x2) 
OMAEONTS 
VMK, 



\ 45 


















oy 
XG 
SRS 
be AX! S 



a 

PERRY 

Humble Company equipped with Blau wires and are for the latter type of 
settings. For this particular instrument the equations in this case are: 
G, 
S 
> 
Q 
Uz 
< 
= 1.59[(As’ — Ae’) — (As — As)], 
2.93 \[(Ag’ = Ae’) -+ (As = Aa) | 
— 2.75[(As’ + Ao’) — (As + A:2)], 
— 2.56[(As’ + Ae’) + (As + As)]. 
The first pair of equations is charted on B1 and the second on B2. An 
examination of the charts will show at once the ease and accuracy with which 
they are read. 
In accordance with the usual notation we have 
174 
At = 1 — Mo, k= 1, 25.3, 
