tachymeter
Noun: A surveying instrument, specifically a type of theodolite, designed for making rapid angular measurements to determine distances and elevations.
A tachymeter is a specialized optical instrument used in surveying and engineering. It is operated by a surveyor to quickly measure horizontal and vertical angles, which are then used in trigonometric calculations to determine distances and height differences between points without the need for direct physical measurement.
- The surveyor used a tachymeter to map the contours of the new construction site efficiently.
- Modern tachymeters often integrate electronic distance measurement (EDM) technology for even faster data collection.
- Before the advent of GPS, the tachymeter was a fundamental tool for topographic surveys.
- Tachymetric Surveying: A surveying method that utilizes a tachymeter to perform stadiametry, where distances are calculated based on the observed angle subtended by a staff of known length.
- Total Station: In modern contexts, the traditional tachymeter's functionality is largely encompassed by an electronic "total station," which combines angle measurement, distance measurement, and data recording.
- Tacheometer: An alternative spelling, more common in British English.
- Tachymetry (noun): The method or process of surveying using a tachymeter.
- Tachymetric (adjective): Relating to or involving tachymetry (e.g., tachymetric calculations).
- Surveying theodolite
- Tacheometer
- Stadia theodolite
The core meaning of "tachymeter" is specifically tied to its function in rapid surveying measurements. It should not be confused with the "tachymeter scale" found on the bezel of some wristwatches, which is used to measure speed based on time. That is a different, though etymologically related, application of the term.
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a theodolite designed for rapid measurements
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