plumb line

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Related to Plumb-bob: plumb line

plumb line

(plŭm līn)
The line that is formed when a string with a weight tied at the end is suspended vertically.
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References in periodicals archive ?
The glideslope intercept point is the FAF for the ILS, and is a plumb-bob point on the ground where the perfect glideslope beam intersects an altitude along the intermediate segment from a perfect altimeter on a standard day.
A plumb-bob (weight), a hunting bow, a shrimp de-veiner and a mousetrap are some of the more obscure items MoMA branded 'good design' over the years.
Almost certainly belonging to an onboard shipwright, the tools include chisels, awls, bow drills, mallets, set-square, ruler, plumb-bob, and whetstone.