This article is about the tool. For the nuclear testing program, see Operation Plumbbob.
"Plumbline" redirects here. For other uses, see Plumbline (disambiguation).
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A plumb bob
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 bone or ivory.
The instrument has been used since at least the time of ancient Egypt[1] to ensure that constructions are "plumb", or vertical. It is also used in surveying, to establish the nadir (opposite of zenith) with respect to gravity of a point in space. It is used with a variety of instruments (including levels, theodolites, and steel tapes) to set the instrument exactly over a fixed survey marker or to transcribe positions onto the ground for placing a marker.[2]
^Denys A. Stocks. Experiments in Egyptian archaeology: stoneworking technology in Ancient Egypt. Routledge; 2003. ISBN 978-0-415-30664-5. p. 180.
^Brinker, Russell Charles; Minnick, Roy, eds. (1995). The surveying handbook. Springer. pp. 93–94. ISBN 978-0-412-98511-9.
A plumbbob, plumbbob level, or plummet, is a weight, usually with a pointed tip on the bottom, suspended from a string and used as a vertical direction...
construction, the direction designated as vertical is usually that along which a plumb-bob hangs. Alternatively, a spirit level that exploits the buoyancy of an...
up Plumb, plumb, or plumb- in Wiktionary, the free dictionary. Plumb may refer to: Plumb (novel series), 1978–1983 novel series by Maurice Gee Plumb, a...
rotation). It is a vector quantity, whose direction coincides with a plumbbob and strength or magnitude is given by the norm g = ‖ g ‖ {\displaystyle...
process is repeated. The board is cut along the dotted lines, and the top plumb cut and the bottom level cut are traced by holding the square on the opposite...
the pendulum's plumb-bob slightly out of true (in the sense that it doesn't point to the centre of mass of the Earth). The change in plumb-line angle against...
purposes, such as in: Anchor Balance weight Ballast Bob Counterweight Fishing sinker Paperweight Plumbbob Tuned mass damper Weight training equipment...
nadir being opposite of zenith and the direction of gravity as defined by a plumb line. 77°47′S 160°33′E / 77.783°S 160.550°E / -77.783; 160.550. A small...
held in tension between Earth and the counterweight like an upside-down plumbbob. The cable thickness is adjusted based on tension; it has its maximum...
brooch suggest the presence of women. One of the inscribed objects is a plumbbob with "CHOI", or "C(o)HO(rtis) I", i.e. "property of the first cohort"...
up plummet in Wiktionary, the free dictionary. Plummet may refer to: Plumbbob, a weighted line used as a vertical reference Sinker (fishing) Plummet...
such that observer can see through telescope conveniently. After this, a plumbbob is suspended from the bottom of the instrument and it should approximately...
A laser line level is a tool combining a spirit level and/or plumbbob with a laser to display an accurately horizontal or vertical illuminated line on...
ability to perceive the world in three dimensions (3D) Fluid pressure Plumb-bob Sea level Deep (disambiguation) This disambiguation page lists articles...
designed to indicate whether a surface is horizontal (level) or vertical (plumb). Two basic designs exist: tubular (or linear) and bull's eye (or circular)...
the octant and sextant. Quadrant A very simple instrument which used a plumbbob. These instruments are also used to measure the angular distance between...
triclinium (now in Naples), the skull is crowned with a carpenter's square and plumb-bob, which dangles before its empty eyesockets (Death as the great leveler)...
change significantly over the course of several days. They can cause a plumbbob to hang about a third of a degree off vertical, pointing toward the mascon...
instrument was basically a carpenter's set square with a graduated arc and plumb-bob placed in the muzzle to measure an elevation. There are suggestions, based...
impressed mark that indicated the precise point over which a surveyor's plumb-bob should be dropped to assure a precise location over it. A triangulation...
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