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The centre of the bottom plate of the tribrach has a 5/8-11 UNC thread bolt hole which is used to attach the tribrach to the tripod. The top plate has three small holes or slots spaced 120˚ apart above leveling thumbscrews, and a locking mechanism which enables a survey instrument or target to be accurately placed on the tribrach and locked in ...
The initial setting operation includes fixing the theodolite on a tripod, along with approximate levelling and centering over the station mark.For setting up the instrument, the tripod is placed over the station with its legs widely spread so that the centre of the tripod head lies above the station point and its head approximately level (by eye estimation).
Angle measurement is typically performed by the operator first occupying a known point, aiming the head of the instrument at a target or prism which exists at either another known point or along an azimuth, which is to be held as a backsight — sighting with the reticle inside the eyepiece — then holding that line as an angle of 00°00 ...
A surveyor's tripod with a shoulder strap. The head of the tripod supports the instrument while the feet are spiked to anchor the tripod to the ground. A surveyor's tripod is a device used to support any one of a number of surveying instruments , such as theodolites , total stations , levels or transits.
Wild brand subtense bar. Another device used in tacheometry to measure distance between the measuring station and a desired point is the subtense bar. [2] This is a rigid rod, usually of a material insensitive to change in temperature such as invar, of fixed length (typically 2 metres (6.6 ft)).
The Möller–Trumbore ray-triangle intersection algorithm, named after its inventors Tomas Möller and Ben Trumbore, is a fast method for calculating the intersection of a ray and a triangle in three dimensions without needing precomputation of the plane equation of the plane containing the triangle. [1]
With information of the given vertex positions ,, of a flat triangle and the according normal vectors ,, at the vertices a cubic Bézier triangle is constructed. In contrast to the notation of the Bézier triangle page the nomenclature follows G. Farin (2002), [2] therefore we denote the 10 control points as with the positive indices holding the condition + + =.
If a taller rod is required, the solid base is usually replaced by a tripod for stability when supporting larger apparatuses, such as extremely large tubes, bulk chemical bottles etc. The height can be adjusted by moving the attached point of the given clamp to the stand. The base lowers the centre of gravity of the stand, thus increasing ...