Sentence examples for rock drill from inspiring English sources
The first patented rock drill was invented in 1849 by J.J. Couch of Philadelphia.
"The mine cannot operate without the rock drill operators," he said.
Another kind of rock drill, called the drifter drill, is used for horizontal holes in mining operations and tunnel driving.
Long after the rock drill was invented, manual drilling by two men was still usual in mining operations.
It creates an ironic distance from the violence of the works introduced (Epstein's Torso from 'Rock Drill' et al).
The $145,000 rock drill, which bores through two feet of granite every 60 seconds, is an even greater luxury.
The generator will be used to charge 36-volt rock-drill batteries, laptops, GPS equipment, camera batteries and satellite phones.
Mr. Dlunga is a rock-drill operator at the Lonmin platinum mine in Marikana, in South Africa's North West Province.
Later they worked together as rock-drill operators, battering platinum ore out of the earth, 5km below ground.
One could do it only if one didn't know that, in 2011, three Lonmin executives earned the same as the combined salaries of 3,600 rock-drill operators.
"The company undermined the bargaining process by unilaterally offering an allowance to rock-drill operators outside the bargaining process," he said.
