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CROSS HAIRS [3 records]

Filter results by subject field Alphabetical list of terms

Filter results by subject field

Alphabetical list of terms

Record 1 2005-12-13

English

Subject field(s)
  • Optics
  • Surveying Instruments
  • Remote Sensing
DEF

An instrument which produces parallel rays of light.

OBS

A collimator usually consists of a tube having an objective converging lens with an arrangement of cross hairs placed in the plane of its principal focus. It is used in testing and adjusting certain optical surveying instruments.

OBS

collimator: term officially approved by the RADARSAT-2 Terminology Approval Group (RTAG).

French

Domaine(s)
  • Optique
  • Instruments d'arpentage
  • Télédétection
DEF

Appareil lenticulaire de visée portant deux lignes de foi (perpendiculaires) et permettant le pointage rapide (souvent à l'infini) d'un appareil d'observation.

OBS

collimateur : terme uniformisé par le Groupe de travail de terminologie de l'Artillerie royale canadienne par le Comité de terminologie française de doctrine et de tactique de l'Armée de terre et par le Groupe de travail de la terminologie de RADARSAT-2 (GTTR).

Spanish

Campo(s) temático(s)
  • Óptica
  • Instrumentos de agrimensura
  • Teledetección
DEF

Instrumento óptico que produce rayos paralelos de luz.

Save record 1

Record 2 1997-08-26

English

Subject field(s)
  • Surveying Instruments
DEF

Stadia. Device used in calculating distance through measurement of angles; specifically, by calculating the distance by proportion to the space on a vertical rod seen between upper and lower instrument cross hairs in a surveyor's level or tansit.

DEF

Stadimeter. An instrument for determining the distance between an observer and an object of known height by measurement of the angle subtended by the object.

OBS

Stadimeter [formed of] stadia (1) + meter.

OBS

Stadia(1) : a method of surveying in which distances are read by noting the interval on a graduated rod intercepted by two parallel cross hairs(stadia hairs or stadia wires) mounted in the telescope of a surveying instrument, the rod being placed at one end of the distance to be measured and the surveying instrument at the other.

French

Domaine(s)
  • Instruments d'arpentage
DEF

Instrument optique de mesure topographique des distances pour les levés de plans: il est composé d'une lunette sur pied au travers de laquelle on vise une mire parlante, ou stadia; le réticule de la lunette comporte deux fils parallèles que l'on fait coïncider avec deux graduations de la mire.

Spanish

Save record 2

Record 3 1976-06-19

English

Subject field(s)
  • Astronomy
OBS

Context : Aligning Antenna Feetchorn... ensure that cross-hairs are properly oriented if not, loosen telescope barrel rotate until cross-hairs are parallel to vertical & horizontal planes

French

Domaine(s)
  • Astronomie
OBS

Lunettes Astro et Télescope

Spanish

Save record 3

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