TONS PER SQUARE INCH 
129 
POSITION of CHARGE C and GAUGES G 
(DISTANCES in FEET) 
SURFACE 
THOUSANOTHS OF A SECOND 
Fig. 1. 300 lbs. of 40/60 Amatol (D, Table VIII.); average of Shots 4, 8, 9, 29, 66; gauges 50 feet 
from centre of charge; maximum pressure = .80. 
Fig. 2. Diagram illustrating the effect of the tension wave reflected from the surface. 
