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Tachymeter |
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tachymeter, tacheometer, tachometer A surveying instrument designed for use in the rapid determination of distance, direction, and difference of elevation from a single observation, using a short base which may be an integral part of the instrument. Tachymeter (or tacheometer), a geodetic instrument used in tachymetric surveying to measure the position of a point relative to the instrument station. The tachymeter permits determination of the horizontal angle β, the vertical angle v, the distance s, and the difference h between the elevation of the point and the elevation of the instrument station. Several types of tachymeters exist. The rotary tachymeter is a repeating transit that has a vertical circle with a cylindrical level; the telescope is provided with stadia hairs. Nomographic and autoreducing tachymeters permit h to be determined from a vertical rod and a nomograph visible in the field of view of the telescope; such tachymeters make use of a double-image range finder to determine horizontal s from a horizontal rod. In another type of tachymeter, the base line is an integral part of the instrument. Such a tachymeter can be used to determine horizontal s directly and to find h from the measured angle v. Want to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit the webmaster's page for free fun content. |
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No references found | Three hand-applied semi-circular counters on a black dial with spiral effect and "Calibre S" and "Laptimer Retrograde" inscriptions; polished 43mm stainless-steel case; fixed black aluminum bezel with tachymeter scale; red second hand; luminescent markers on the red-tipped counter hands and the indexes; polished pushbutton crown with black varnish; hand-applied TAG Heuer logo; water resistant to 100 metres and a black strap with red stitch lining. The Navitimer wrist instrument is equipped with a circular slide rule that can be used for basic math, as a telemeter, pulsometer, tachymeter, currency converter. The series also includes automatic mechanical chronographs with a date window at six o'clock and a tachymeter on the dial. |
Tachymeter |
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