International Correspondence Schools · Scranton, Pa. : The Colliery engineer co. · leaf 365
Fig. 448. the other, and provided with clamps by means of whichthey are adjusted to any desired length. The plank is laiddirectly upon these pipe supports. The air for working thedrills is carried from the air pipe G to the bench by meansof the bench hose //. The manifold K attached to the endof… … As the work advances from the tunnel entrance, or fromthe foot of the shaft, more time is required to haul awaythe loaded cars and bring back theempty ones. When one mule is nolonger able to perform the work asecond one is added, and passingbranches are built in the main trackat suitable intervals,…
Railroad engineering
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