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| | 202 to 206 of 227 glossary terms |
| theodolite: surveying instrument for measuring horizontal angles, and perhaps vertical angles, see article on the theodolite.
| theodolite and sundial: an instrument combining the functions of a sundial and a theodolite.
| throne: part of an astrolabe, connecting the instrument to the suspension shackle, see article on the astrolabe.
| 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.
| triangulation instrument: instrument with three jointed arms with scales for surveying or range-finding, see article on the triangulation instrument.
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