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  2. Temporary adjustments of theodolites - Wikipedia

    en.wikipedia.org/wiki/Temporary_adjustments_of...

    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).

  3. Tribrach (instrument) - Wikipedia

    en.wikipedia.org/wiki/Tribrach_(instrument)

    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 ...

  4. Theodolite - Wikipedia

    en.wikipedia.org/wiki/Theodolite

    A theodolite (/ θ i ˈ ɒ d ə ˌ l aɪ t /) [1] is a precision optical instrument for measuring angles between designated visible points in the horizontal and vertical planes. The traditional use has been for land surveying , but it is also used extensively for building and infrastructure construction , and some specialized applications such ...

  5. Tripod (surveying) - Wikipedia

    en.wikipedia.org/wiki/Tripod_(surveying)

    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.

  6. Tacheometry - Wikipedia

    en.wikipedia.org/wiki/Tacheometry

    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)).

  7. Möller–Trumbore intersection algorithm - Wikipedia

    en.wikipedia.org/wiki/Möller–Trumbore...

    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]

  8. Nine-point circle - Wikipedia

    en.wikipedia.org/wiki/Nine-point_circle

    The nine points. In geometry, the nine-point circle is a circle that can be constructed for any given triangle. It is so named because it passes through nine significant concyclic points defined from the triangle. These nine points are: The midpoint of each side of the triangle; The foot of each altitude

  9. Tripod (laboratory) - Wikipedia

    en.wikipedia.org/wiki/Tripod_(laboratory)

    A laboratory tripod is a three-legged platform used to support flasks and beakers. Tripods are usually made of stainless steel or aluminium and made light-weight for efficient portability within the lab.