148 
A Coprer Tse & GAUGES 
a7 4 7 
VOD lo ES SIA 
Fig 42. Diagram showing the layout of a bottom shot (Shots 75, 76, 78) ; all distances are marked in feet. 
Fig. 43. Diagram showing the layout of Shot 105, for measuring the velocity of the pressure wave; A, A. 
contacts; B, water-tight box containing chronograph, etc. ; C, raft consisting of a plank lashed 
across a pair of barrels ; D, 4-wire cable from box to ship ; ‘all distances are marked in feet. 
