explosion is eight one-inch bolts. Heavy timbers, shown in Figs. 7 and 8. A hole, 56 square serving as a support, were placed upon inches in area, was blown through all the the ground at a distance of 4J feet from plates and a hole, 18 inches deep, was one another, and the plate was laid hori-… … Fig. 7. passed nearly through the timbers. The and reached a depth of indent of 7J plates were of the same lot as those used inches at the hole. The area of the base in the other targets at the Experimental of the charge, before explosion, was about Battery, and in order to counteract as far double…
Engineering
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