276 
MINUTES OF PEOCEEDINGS OF 
But 
and 
EF— EC cos 60 ° = EC sin 60 ° cos 60 ° 
-^BC; 
BF* = BE* + FT* — ~BA* + 
= 7 BW + ^-BCP 
4 lo 
-n*’’ 
Substituting this in (3), and writing *15 for p, we get 
R = 32*17 cwt. 
Let P be the strain at B or A; then 
P 2 = R2 + ^R* 
= R*(l+^), 
or P = P /l + jjfl s 32*17 X1-01 
= 32*5 cwt. nearly. 
t 
