158 5 
Fic. 63.— Photograph of an 11 4 mine case. Fic. 64.—Photograph of an H+ mine case which had 
been put down at a distance of 126 feet from a 
1,600-lb. charge of 80/20 Amatol. (Shot 83.) 
Fic. 65.—Photograph showing the method of 
hanging the gauges on a wire rope. 
