plummet

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Related to plummets: lead astray

plummet

a lead plumb used by anglers to determine the depth of water

plummet

[′pləm·ət]
(engineering)
A loose-fitting metal plug in a tapered rotameter tube which moves upward (or downward) with an increase (or decrease) in fluid flow rate upward through the tube. Also known as float.

plumb bob, plummet

A shaped metal weight which is suspended from the lower end of a line to determine the vertical. (See illustration p. 744.)
References in classic literature ?
Surely the long straight rows of stately poplars that divide the beautiful landscape like the squares of a checker-board are set with line and plummet, and their uniform height determined with a spirit level.
Then his heart sank within him like a plummet of lead, but nevertheless he spoke up boldly.
He told her then of his life since he had returned to the jungle--of how he had dropped like a plummet from a civilized Parisian to a savage Waziri warrior, and from there back to the brute that he had been raised.