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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 ...
In posture analysis, the spine is compared to a plumb line to detect the aforementioned abnormalities. From the anterior/posterior view this plumb line should run vertically down the midline of the body dividing it symmetrically into right and left halves indicating even weight distribution on left and right sides.
The vertical deflection (VD) or deflection of the vertical (DoV), also known as deflection of the plumb line and astro-geodetic deflection, is a measure of how far the gravity direction at a given point of interest is rotated by local mass anomalies such as nearby mountains.
Vertical position or vertical location is a position along a vertical direction (the plumb line direction) above or below a given vertical datum (a reference level surface, such as mean sea level). Vertical distance or vertical separation is the distance between two vertical positions.
The difference between the direction of a plumb line or vertical, and a line perpendicular to the surface of the ellipsoid of revolution – a normal to said ellipsoid – at a particular observatory, is the deflection of the vertical. [8] A GPS receiver at the marking strip of the Greenwich Meridian in front of the Royal Observatory.
The deflection is the difference between the true zenith Z as determined by astrometry, and the apparent zenith Z′ as determined by a plumb-line. Observatories were constructed to the north and south of the mountain, plus a bothy to accommodate equipment and the scientists. [6] The ruins of these structures remain on the mountainside.
A plumbline is a string with a lead (Latin plumbum) weight (or plumb bob), used to provide a vertical reference line. It may also refer to: The Plumbline, a joke newspaper produced by the McMaster Engineering Society; the vertical direction, a line orthogonal to the geoid, as used in geodesy
[2] [3] It is a vector quantity, whose direction coincides with a plumb bob and strength or magnitude is given by the norm = ‖ ‖. In SI units, this acceleration is expressed in metres per second squared (in symbols, m/s 2 or m·s −2) or equivalently in newtons per kilogram (N/kg or N·kg −1).