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Possible Answers:
ROIL.
Last seen on: NY Times Crossword 16 Mar 23, Thursday
Random information on the term “Churn”:
The churn drill is a large drilling machine that bores large diameter holes in the ground. In mining, they were used to drill into the soft carbonate rocks of lead and zinc hosted regions to extract bulk samples of the ore. Churn drills are also called percussion drills as they function by lifting and dropping a heavy chisel-like bit which breaks the rock as it falls. Churn drills are most effective in soft- to medium-density rock of relative shallow depth (10–50 metres).
Churn drills were invented as early as 221 BC in Qin dynasty China, capable of reaching a depth of 1500 m. Churn drills in ancient China were built of wood and labor-intensive, but were able to go through solid rock. The churn drill was transmitted to Europe during the 12th century. A churn drill using steam power, based on “the ancient Chinese method of lifting and dropping a rod tipped with a bit,” was first built in 1835 by Isaac Singer in the United States, according to The History of Grinding. In America, they were common in the Tri-State areas during the lead and zinc mining in Missouri, Oklahoma, and Kansas.