307 
ae 2u 
ee SS 
7, =~ 
. ae 
Oma x bw 
VY 
‘ . 
p 
(@) CIRCULAR ARC. 
(b) _ARC OF EQUIANGULAR SPIRAL. 
FIG.2. CURVILINEAR CHARGES. O !S THE POINT OF 
DETONATOR, OL THE CHARGE AND P THE POINT 
OF MEASUREMENT. 
Oept. of Scientific & Industrial Research 
Road Research Laboretory. Note No. ADM 153/GC ARB. slFs.3590 
