Smithsonian Report, 1939.— Hodgson 



Plate 2 



SEISMIC Shooting. 



Top left; Attaching dynamite to loading pole and preparing firing cap and wires. 



Top right: Lowering charge with loading poles. 



Bottom left: Method of measuring dynamite charges by cutting sections from 2i/2-pound sticks. 



Bottom right: Set up-for a regulation shot (in this case bedded with an overload of water). 



