compressed air drill造句

He also built new smelters using innovative methods developed by his brothers, including steam engines and diamond and compressed air drills.
Longyear purchased the rights to make and sell Chicago Pneumatic's small CP-65 compressed air drill designed for underground use.
Power for the work's 12 compressed air drills was supplied by a hydro-electric plant situated about six miles from the scene of operations.
Kellow introduced compressed air drills, which were fed by a small water-powered compressor located near the foot of the incline to the nearby Rhosydd Quarry.
They did have for tunneling truck-mounted water-cooled compressed air drills called " Jumbos . " After the initial holes were drilled into the substrata, dynamite was used for blasting away the rock.
It's difficult to find compressed air drill in a sentence. 用compressed air drill造句挺难的

The rock was extremely hard and the height of the surface above the tunnel prevented the sinking of shafts, so that tunnelling could only proceed from the two ends . 1, 100 men were engaged on the work, and compressed air drills, then something of a novelty, and blasting, were employed.