The Drawworks and the Compound: Unit 1, Lesson 6 (Rotary Drilling) (Rotary Drilling, Unit 1, Lesson 6)

Replaces The Hoist lesson in the series and presents detailed information on the drawworks including clutches, transmission, sprock-ets, drum, and brakes. Measurements are given in both U.S. and SI units. Also includes illustrations, summaries, review questions, and a glossary.