Bible Dictionaries
Tachymeter

Webster's Dictionary

(1):

(n.) An instrument, esp. a transit or theodolite with stadia wires, for determining quickly the distances, bearings, and elevations of distant objects.

(2):

(n.) A speed indicator; a tachometer.

Bibliography Information
Webster, Noah. Entry for 'Tachymeter'. Noah Webster's American Dictionary. https://www.studylight.org/​dictionaries/​eng/​web/​t/tachymeter.html. 1828.