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| 204 to 208 of 227 glossary terms |
| 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.
| trigonus: triangular element in the type of altitude dial known as the 'organum Ptolemai'.
| tripod base: base of a tripod (three-legged support) on which to stand an instrument.
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