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surveyor's square: another name for a surveyor's cross.
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theodolite: surveying instrument for measuring horizontal angles, and perhaps vertical angles, see article on the theodolite.
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theodolite and sundial: an instrument combining the functions of a sundial and a theodolite.
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throne: part of an astrolabe, connecting the instrument to the suspension shackle, see article on the astrolabe.
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triangulation: surveying technique involving the measurement of a baseline, the location of other stations by taking angles from either end, and perhaps the extension of the survey through the addition of further triangles.
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