Wuxing originally referred to the five (from : , , , , ), which were with the combination of the and the , conceived as creating the five forces of earthly life (including ). This is why the word is composed of Chinese characters meaning "five" (; wǔ) and "moving" (; xíng). "Moving" is shorthand for "pla. [pdf]
One company, Maersk Drilling, is leading the way with its fleet of three state-of-the-art XLE jack-up rigs – named Intrepid, Interceptor and Integrator, and a fourth known as XLE4 which will be delivered b. [pdf]
A down-the-hole drill, usually called DTH by most professionals, is basically a screwed on the bottom of a . The fast hammer action breaks hard rock into small cuttings and dust that are evacuated by a fluid (air, water or ). The DTH hammer is one of the fastest ways to drill hard rock. The system is thought to have been invented independently by Stenuic. [pdf]
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