1) In coal-mining, this was a hole or depression set beneath the lowest landing in a shaft, where water gathered before draining away or being pumped to the surface.

1704 Jo. Harrison paid Ad. for sump, Farnley

1763 for a boy ladeing water a week in the sump, Tong.

places Farnley Tong
dates 1704 1763

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Photo by Kreuzschnabel CC BY-SA 3.0