collimating
61collimation — noun a) the act of collimating or something collimated b) aligning lenses along line of sight to minimize aberrations See Also: collimate, collimator …
62Collimator sight — A collimator sight is a type of optical sight that allows the user looking into it to see an illuminated aiming point aligned with the device the sight is attached to regardless of eye position (with little parallax).[1] Collimator sights are… …
63Schiehallion experiment — Schiehallion s isolated position and symmetrical shape lent well to the experiment The Schiehallion experiment was an 18th century experiment to determine the mean density of the Earth. Funded by a grant from the …
64Microbeam — A microbeam is a narrow beam of radiation, of micrometer or sub micrometer dimensions. Together with integrated imaging techniques, microbeams allow precisely defined quantities of damage to be introduced at precisely defined locations. Thus, the …
65useful beam — in radiology, that part of the primary radiation that is permitted to emerge from the tubehead assembly of an x ray machine, as limited by the tubehead aperture or port and accessory collimating devices …
66fiducial axis — The line joining opposite fiducial marks on a photograph. A fiducial mark is any marker built into an aerial camera that registers its image on an aerial photograph as a fixed reference mark. The image cast on a photograph by such a marker is… …
67fiducial marks — Any marker built into an aerial camera that registers its image on an aerial photograph as a fixed reference mark in the form of an image is called a fiducial mark. These are usually four fiducial marks on a photograph and are used to define the… …
68index marks — As it pertains to aerial photography, the marks that form images on a negative and indicate the principal point of imagery. See collimating marks …
69collimator — col•li•ma•tor [[t]ˈkɒl əˌmeɪ tər[/t]] n. 1) opt a fixed telescope for use in collimating other instruments 2) an optical system that transmits parallel rays of light 3) phs a device for producing a particle beam in which all the particle paths… …
70spectroscope — spec•tro•scope [[t]ˈspɛk trəˌskoʊp[/t]] n. opt an optical device consisting essentially of a collimating lens and a prism, for observing a spectrum of light or radiation • Etymology: 1860–65 spec tro•scop′ic ˈskɒp ɪk spec tro•scop′i•cal,adj. spec …
