At 52 ft. 



At 55 ft. 



Charge dgpth 3 ft. 



At 52 ft 



Charge dgpth 4 ft. 9in. 



At 52 ft 



20 



40 



At 55 ft. 0f\ ^ Maasurements 



, f urty/ uncertain because 



// \ 



!' \ 



p — V 



\ 



Charge depth 6 ft. 6 in. 



Frames 



80 



lOO 



120 



(Arbitrary zero) 



F,g 



60 

 TIME 



2. WAVE AMPLITUDE AS FUNCTION OF TIME AT HORIZONTAL 

 DISTANCES OF 52 ft AND 55 ft FROM THE CHARGE 

 FRAME SPEED 14 5 /sec 



