International Correspondence Schools · Scranton, Pa. : The Colliery engineer co. · leaf 360
.The center cut offers the greatest resistance to blasting.The holes are consequently loaded with more powerfulexplosives than are used for either side rounds or bench. In driving the New York aqueduct tunnel, the cut wasloaded with dynamite containing from 60 to 80 per cent, ofnitro-glycerine,… … Fig. 446. always attended with great danger. After several prema-ture explosions, resulting in considerable loss of life, the useof pure nitro-glycerine was abandoned. The effect of firingthe cut is generally to pulverize the rock, and all tunnelblasting is intended to so break the rock as to…
Railroad engineering
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