. Handbook for rangers & woodsmen . Fig. 63.—Mudcapping. and laid on top of the boulder in a compact pile. The cap isplaced at or near the center of the charge and the whole is thencovered with 6 or 8 inches of very damp sand or stiff, wet is pressed tightly down over the charge and serves astamping. The method is illustrated in Fig. 63. Blockholing.—This method of breaking out a boulder is shownin Fig. 64, and is also known as splitting. Its chief dis-advantage lies in the necessity for drilling one or more holes CONSTRUCTION WORK 81 in the boulder, but this is more than offset by t
. Handbook for rangers & woodsmen . Fig. 63.—Mudcapping. and laid on top of the boulder in a compact pile. The cap isplaced at or near the center of the charge and the whole is thencovered with 6 or 8 inches of very damp sand or stiff, wet is pressed tightly down over the charge and serves astamping. The method is illustrated in Fig. 63. Blockholing.—This method of breaking out a boulder is shownin Fig. 64, and is also known as splitting. Its chief dis-advantage lies in the necessity for drilling one or more holes CONSTRUCTION WORK 81 in the boulder, but this is more than offset by the much moreeffective results obtained. In order to concentrate the chargeas much as possible the cartridge should be broken up and TampingDynamite Primer. Fig. 64.—Blocklioling. tamped in about the cap. Later, if fragments too large tohandle remain, they may be mudcapped. Snakeholing.—For small boulders that can be easil}^ removedafter having been broken from their bed, this method, also knownas gophering, is very effective. The charge should be placed
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