- Industry: Earth science
- Number of terms: 93452
- Number of blossaries: 0
- Company Profile:
Founded in 1941, the American Congress on Surveying and Mapping (ACSM) is an international association representing the interests of professionals in surveying, mapping and communicating spatial data relating to the Earth's surface. Today, ACSM's members include more than 7,000 surveyors, ...
A gyroscope whose axis of rotation is constrained, by a suitable weight, to remain horizontal.
Industry:Earth science
A temporary marker, usually a wooden stake with a tack or small nail on top to indicate the exact point of reference for angular and linear measurements, driven flush with the ground at a traverse station.
Industry:Earth science
Any type of corer which penetrates the bottom solely because of its weight.
Industry:Earth science
Essentially, a barometer in which the end ordinarily open to the air is sealed off, inclosing a suitable amount of air. The height of the mercury column in the tube then depends on the weight of the mercury and the pressure of the contained air. The pressure of the contained air depends mostly on the air's temperature. An accuracy of 1 mgal can be attained only if the height of the mercury and the temperature of the air are measured with extremely high accuracy.
Industry:Earth science
A mathematically-defined function which gives values of gravity close to those of the actual gravity field and having, usually, at least one equipotential surface which is mathematically simple (e.g., a rotational ellipsoid)
Industry:Earth science
Measuring distances by holding the stadia rod horizontal and the stadia hairs of the telescope vertical during observations.
Industry:Earth science
The value of gravity found by measuring gravity at one place, the instrument being calibrated by comparison with gravity at another place where the value is taken as known or standard. E.g., values of gravity determined using spring type gravimeters are relative to the value of gravity at a base station such as that at Potsdam or to the value obtained by averaging over measurements at a number of stations.
Industry:Earth science
A way open to the public at large for travel and transportation, without restriction except as such is incident to secure to the general public the largest benefit and enjoyment.
Industry:Earth science
(1) A tract of wasteland. (2) An open, level region clothed with a characteristic vegetation consisting principally of underbrush of the genus Erica. (Brit.
Industry:Earth science
