TACHYMETER
tachymeter, tacheometer
(noun) a theodolite designed for rapid measurements
Source: WordNet® 3.1
Etymology
Noun
tachymeter (plural tachymeters)
A surveying instrument for quickly finding distances.
A speed indicator; a tachometer.
Source: Wiktionary
Ta*chym"e*ter, n. [Tachy- + -meter.]
1. (Surveying) An instrument, esp. a transit or theodolite with
stadia wires, for determining quickly the distances, bearings, and
elevations of distant objects.
2. A speed indicator; a tachometer.
Source: Webster’s Unabridged Dictionary 1913 Edition