- 行业: 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 reflecting telescope which reflects incoming radiation from the paraboloidal primary mirror to a small, hyperboloidal secondary mirror and thence back through a hole in the primary mirror to the detecting device or observer. Cassegrainian telescopes have been made for use at radio wavelengths through the spectrum to the far ultraviolet. The combination of paraboloidal and hyperboloidal mirrors makes the telescope much shorter than a telescope of the same focal length and with a flat secondary mirror.
Industry:Earth science
In the representation of a periodic phenomenon by Fourier series, one of the terms in that series.
Industry:Earth science
A temporary bench mark placed at the junction between two sections of a line of levels. The term is obsolete.
Industry:Earth science
The Roman system of land surveying, carried out as rectangular surveys.
Industry:Earth science
A program converting a program written in a code (language) other than that directly usable by the computer into the code used by the computer (machine language).
Industry:Earth science
That point, in a suspended bar, which is located at such a distance below the point of suspension that a force applied perpendicular to the line joining the two points causes no reaction at the point of suspension.
Industry:Earth science
The line midway between the side lines of any strip of land of uniform width as, e.g., a street or right of way.
Industry:Earth science
A bank's bank and a public authority that regulates a nation's depository institutions and controls the quantity of money.
Industry:Earth science
A class of panoramic camera in which a double dove prism in front of the lens system is rotated while the lens system itself remains fixed. This configuration allows photographing through 180<sup>o</sup> or more.
Industry:Earth science
