The word "tacheometer" refers to a device that measures distances and angles in surveying. It is spelled as [ta-kē-äm-i-tər], with stress on the second syllable. The "ta" is pronounced as in "cat," the "kē" as in "key," the "äm" as in "ham," the "i" as in "bit," and the final "tər" as in "meter." The spelling of this word has remained consistent over time and is derived from the Greek words "tachos" (speed) and "metron" (measure).
A tacheometer is a surveying instrument used to measure distances, angles, and heights in land surveying and engineering applications. It combines the functions of a theodolite (a device used to measure horizontal and vertical angles) and a stadia (or stadia rod), which is a graduated staff used for distance measurements.
The tacheometer operates on the principle of stadia measurement, where a graduated reticle is placed in the telescope of the instrument and the observer reads the difference in graduations on the staff to determine distances. This allows for rapid and accurate measurements without the need for complex calculations.
The instrument is commonly used for topographic surveys, geodetic control surveys, and construction layout. It is particularly useful in areas with rugged terrain, where traditional methods of measurement may be difficult or time-consuming.
The tacheometer is typically equipped with various features, such as a leveling bubble to ensure the instrument is properly aligned, a telescope with crosshairs for aiming, and a focusing mechanism for clear visibility. Some advanced models may also include electronic distance measuring devices (EDMs) for even more precise distance measurements.
Overall, the tacheometer is an essential tool in surveying and engineering, providing accurate and efficient measurements of distances, angles, and heights in a variety of land surveying applications.
Tachometer.
A practical medical dictionary. By Stedman, Thomas Lathrop. Published 1920.
The word "tacheometer" is derived from two Greek roots: "tachéo" meaning "to go quickly" or "to move fast" and "metron" meaning "measure". The combination of these two roots forms the word "tacheometer", which refers to a surveying instrument used for measuring distances and angles simultaneously. The term was first recorded in English in the late 19th century.