Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. A tachymeter or tacheometer is a kind of theodolite used for rapid measurements and determines, electronically or electro-optically, the distance to target, and is highly automated in its operations. Such tachymeters are often used in surveying. A tachymeter scale is also used as the name of the scale sometimes inscribed around the rim of an analog watch, useful in converting time intervals to speed or other rates of events. Tachymetry or tacheometry is the process of measuring distance indirectly. This can be done by measuring time and speed in a moving vehicle or by sighting through small angle a distant scale transverse to the line of sight.

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