- 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 liquid having a dense, opaque substance in suspension and painted on a transparent material to render that material opaque. Opaquing fluid is used in the graphic arts to correct errors made in photoengraving, to change parts of a picture, etc.
Industry:Earth science
A region (space) at every point of which are defined two forces (vectors) a force capable of accelerating electrically charged particles by an amount proportional to the charge and a force capable of accelerating moving, electrically charged particles by an amount proportional to the charge and the speed. Alternatively, it can be defined as a region in which there exist an electrostatic field and a magnetic field, with the two fields related through Maxwell's equations.
Industry:Earth science
An estate or inheritance limited to some particular class of person to whom it is granted. Estates in fee tail have been abolished in most States, converting them to fee-simple estates.
Industry:Earth science
A device for holding in contact the negative photographic film and the light-sensitive material on which the image is to be placed, during the exposure. The source of light may or may not be a part of the device. If the frame contains a vacuum pump to exhaust air within the frame (to ensure contact between the negative photographic film and the light-sensitive material, it is called a contact vacuum printing frame.
Industry:Earth science
A device which transmits a specified band or bands of frequencies in the optical (light) portion of the spectrum but substantially attenuates all other frequencies. The term is also applied to a similar device which works on infrared radiation but such a device is better termed an infrared filter. The most common type of optical filter is the absorption filter, which transmits the desired frequencies with little attenuation but absorbs most of the unwanted radiation. It is quite inexpensive but does not cut off the undesired colors sharply. An interference filter reflects the incident light between semi reflecting surfaces in such a way that light at the undesired frequencies is canceled by interference but light at the desired frequencies is strengthened. Such a filter is considerably more expensive than an absorption filter but can (in fact usually does) produce an extremely narrow band of transmitted light.
Industry:Earth science
An instrument which measures the rate at which water flows past or through it. The term is more general than current meter.
Industry:Earth science
The slope put into the plastic surface of a plastic relief map, extending from the heights along the neatline to a flat portion beyond the neatline, at an angle no greater than 45<sup>o</sup>, to avoid forming the plastic sheet at an angle of 90<sup>o</sup> at the neatline.
Industry:Earth science
A day of the week, identified by number e.g., the 4th feria for Wednesday.
Industry:Earth science
(1) A partially reflecting surface produced by placing several thin metallic coatings on the surfaces of glass plates or prisms to produce interference and permit only a narrow band of frequencies to pass through. (2) A colorless optical filter containing uniformly oriented molecules which permit only light of a certain polarization to pass.
Industry:Earth science
(1) A location obtained, from astronomical observations, as the intersection of lines of position. The act of obtaining such a location is called obtaining a fix or getting a fix. (2) The location, obtained by surveying and indicated on a map, of a point at which observations were made. (3) The act of obtaining, by surveying, the location of the point at which the observations were made, and then indicating this location on a map. (4) The location, obtained by surveying, of a point at which observations were made. (5) The act of obtaining, by surveying, the location of a point at which observations were made. (6) A location obtained by computation from data obtained at other locations and used as the location of a control point. (7) A relatively accurate location determined without reference to any former location. A pinpoint is a very accurate fix, usually established by passing over or very close to an aid to navigation or a landmark of small extent.
Industry:Earth science
