1919.] 
New Zealand Institute Science Congress. 
311 
AA = 74 ft. 10 in. ; BB' = 64 ft. 4 in. ; CC' = 64 ft. 4 in. ; DD' = 51 ft. 
6 in. ; r a = r b = r c = 0*2 in. ; r d = 0-08 in. 
AA' 898 
log-= log —— = log 4490 = 8-4096 
f a 0’2 
BB' 772 
log-= log - = log 3860 = 8-2584 
r a & 0*2 & 
CC' 772 
log-- = log — - log 3860 = 8-2584 
r a 0-2 & 
DD' 618 
log —= log —— = log 7725 = 8-9516. 
r d 
DA' AD' 7^9 
log DA~ = log AD = 13Tb = log 544 = 1,6938 
DB' 
BD' 692 
rvp ^°o i) ] \ 
DB 
DC' 
BD 80-5 
CD' 
l0g DU = l0g rfFT = lo § 
699 
CD 
9D5 
log 8-596 = 2-1513 
log 7-6393 = 2-0333 
With respect to circuit A we have— 
AA' 
<h = 2 log-= 2 X 8-4096 = 16-8192 
a 2 = 2 log 
DD' 
2 X 8-9516 = 17-9032 
DA' 
A = A = 2 log - = 2 X 1-6938 = 3-3876 
UA 
M d :.== 
M a = 
C d = 
A 
3-3876 
3-3876 
AA — a,a 2 (3-3876) 2 —(16-8192 X 17-9032) -289-6417 
A 3-3876 _ 3-3876 
ala 2 - AA ~ (16-8192 X 17-9032) - (3-3876) 2 “ 28<T64l7 
=f — 0-01169 
= +0-01169 
CL 
bA — CLi CL-2 
M d 
16-8192 
- 289-6417 
-0-01169 
M a + C d “ 0-01169 - 0-0581 
With respect to circuit B we have- 
= - 0-0581 
- 0-01169 
0-04641 
0-2518 
a, = 2 log — = 16-5168 
DD' 
= 2 log- = 17-9032 
r d 
DP' 
b x — A = 2 log gg- = 4-3026 
M„ 
A 
a 
- AA - 
A 
a& 2 
Cl\0/-2 
bA 
a 
~ bA - 
a, a 
M d 
M b -j~ Cd 
= - 0 01552 
= A 0-01552 
= — 0-05959 
= + 0-3522 
