tachymeter
ta·chym·e·ter
T0008000 (tă-kĭm′ĭ-tər, tə-)tachymeter
(tæˈkɪmɪtə)tachymeter
| Noun | 1. | tachymeter - a theodolite designed for rapid measurements |
| 单词 | tachymeter | |||
| 释义 | tachymeterta·chym·e·terT0008000 (tă-kĭm′ĭ-tər, tə-)tachymeter(tæˈkɪmɪtə)tachymeter
TachymeterTachymeter(or tacheometer), a geodetic instrument used in tachymetric surveying to measure the position of a point relative to the instrument station. The tachymeter permits determination of the horizontal angle β, the vertical angle v, the distance s, and the difference h between the elevation of the point and the elevation of the instrument station. Several types of tachymeters exist. The rotary tachymeter is a repeating transit that has a vertical circle with a cylindrical level; the telescope is provided with stadia hairs. Nomographic and autoreducing tachymeters permit h to be determined from a vertical rod and a nomograph visible in the field of view of the telescope; such tachymeters make use of a double-image range finder to determine horizontal s from a horizontal rod. In another type of tachymeter, the base line is an integral part of the instrument. Such a tachymeter can be used to determine horizontal s directly and to find h from the measured angle v. tachymeter, tacheometer, tachometertachymetertachymeter[tah-kim´ĕ-ter]tachymeter
Synonyms for tachymeter
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