716 
-10=— 
Table I will be found convenient for making conversions from one ratio to 
another. 
Table I, Conversion from one type of ratio to another. 
Ratio 
Row). Uva | Dig Wg VDq doy doy 
Wanted 
Da 
“ba at 
Tar a eae 
a ms Da | nay 
Extreme caution must be exercised in converting from one type of ratio 
to another, due to the high sensitivity of the conversions to weight and 
distance exponents. The weight and distance exponents for the mechanical 
gauges are not constant for different charge weights and different charge— 
to=gauge distances, since the gauge reading is dependent on the decay con— 
stant of the shock wave. Any determination of gauge exponents suffers from 
very low precision,2 originating in uncontrolled variables (such as load— 
ing variations) over the large number of shots necessary, and, to a certain 
extent, in the inherent difficulties discussed above. 
6 Other types of data obtained 
Data were obtained in the course of these studies in addition to the 
comparison of the effectiveness of various explosives, Among these were: 
(a) Effect of charge orientation, — The asymmetry of the shock wave 
resulting from the explosion of an asymmetrical charge was determined, 
usually as a secondary variable in an explosives comparison series, This 
information was useful in ascertaining whether or not a major portion of the 
explosive energy was being released in a direction which was not likely to 
include a target. 
(b) Booster effects. — The size, composition and location of boosters 
were also studied, both as primary variables in series especially designed 
to study booster effects, and as secondary variables in explosives comparison 
serieSe 
] i 
3 See Sec. 8(d). 
