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- DictionaryPlumb line/ˈpləmˌlīn/
noun
- 1. a line with a plumb attached to it, used for finding the depth of water or determining the vertical on an upright surface.
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- Plumb bob
Weight, usually with a pointed tip on the bottom, suspended from a string and used as a vertical reference line
A plumb bob, plumb bob level, or plummet, is a weight, usually with a pointed tip on the bottom, suspended from a string and used as a vertical direction as a reference line, or plumb-line. It is a precursor to the spirit level and used to establish a vertical datum. It is typically made of stone, wood, or lead, but can also be made of other metals. If it is used for decoration, it may be made of ... Wikipedia
