62 
From Y. 
Ranges 
1000 
2000 
3000 
4000 
5000 
6000 
A CALCULATION OF PROBABILITY OF FIRE. 
p=0 
202°2 
194:9 
164:°7 
148°1 
130 
122 
h 
Values of : 
tan 6 
Ranges 
1000=102°2 
2000 94°88 
3000 64°73 
4000 43:11 
5000 30°04 
6000 22°04 
TABLE VI. 
Values of A. 
o=15° ¢=30°0 f=45° 6=60° g¢=75° g¢=90° 
164:2 140 129°9 P25 oI 122°8 122°2 
1569 132°7 122°6 1178 1155 114:9 
126-7 102°5 92°4 87°6 85°3 84:7 
105°1 80:9 70°8 66 63°7 63:1 
92 67°8 57-7 52°9 50°6 50 
84 59°8 49°7 44-9 42°6 42, 
Calculation of B. 
vg h h 
pe mo : 
= 77 = 7 a (2). 
Omitting intermediate steps the result is tabulated. 
Ranges 
1000 
2000 
3000 
4000 
5000 
6000 
dX can be taken 
B (Tasie VIL). 
p=15° ¢=30° f=45° fp =60° f= 75° =f = 90° 
29°5 50 68 83'5 92°5 96°5 
30 50 68 83 93 96 
29 49 68 82 91°5 95 
28 475 65°5 80°5 915 93. 
275 46°5 645 79 88°5 915 
27 46 63 775 87 90 
Calculation of M. 
WhO IRTOTE IN III NO oy obconssbGnbonponsoananbosons 
GAB 
aX=dX,/1+2 = cet dlc care reeled nm 
as 1 per cent. of the range. 
The value of ~ is obtained as previously explained. 
(5). 
