Optics. a fixed telescope for use in collimating other instruments.an optical system that transmits parallel rays of light, as the receiving lens or telescope of a spectroscope.
Physics. a device for producing a beam of particles in which the paths of all the particles are parallel.
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The slit and lens, together with the tube in which they are usually supported, are called a collimator.
The form of spectroscope mentioned above, in which the collimator and slit are replaced by a concave lens, will be tried.
The French collimator sight for the 75-millimeter gun presented difficulties to the manufacturer, especially in the optical parts.
The collimator and observing telescope have an aperture of 25 mm., focus of 200 mm.
The slit and collimator are shown; the micrometer end of the observing telescope is out of the picture.