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Treacle was an old English word for medicine, and was also used to describe dark coloured undrinkable water, which from its foul palate was associated with the commonly held taste of medicine. Consequently a well where the water became undrinkable would be termed a âtreacle wellâ.
Trepanning is used for larger hole diameters and where machine power is limited, because it is not as powerconsuming as solid drilling.The trepanning tool does not machine the whole diameter, only a ring at the periphery.repanning is used for larger hole diameters and where machine power is limited, because it is not as powerconsuming as solid drilling.