International Correspondence Schools · Scranton, Pa. : The Colliery engineer co. · leaf 344
fore stated, when percussiondrills are used for surface work,they are operated by steam whichis usually generated in a portable fig. a-m.boiler and conveyed to the drills through ironpipes. The direct connection with the drills isFIG. 419. made by means of steam hose. When the workis of great… … Fig. 421. air compressor and conveyed thence by iron pipes and steamhose to the drills. The receiver is a wrought-iron cylinder,from 2 to 4 feet in diameter and from 5 to 12 feet long. Acut of a light duplex eonipressor made by the Rand Drill Co.is shown in Fig. 421. It is so made that it can…
Railroad engineering
Internet Archive · California Digital Library · Public Domain Mark 1.0. Free to use for anything.
