1) Measuring instrument 2) Optical device
Found on
https://www.crosswordclues.com/clue/autocollimator
An autocollimator is an optical instrument for non-contact measurement of angles. They are typically used to align components and measure deflections in optical or mechanical systems. An autocollimator works by projecting an image onto a target mirror, and measuring the deflection of the returned image against a scale, either visually or by means ...
Found on
http://en.wikipedia.org/wiki/Autocollimator
autocollimator An instrument combining the functions of a telescope and a collimator for detecting and measuring very small deviations in a beam of light. A collimator is a fixed telescope for use in collimating or adjusting the line of sight (of a telescope).
Found on
http://www.wordinfo.info/words/index/info/view_unit/262/5
an instrument combining the functions of a telescope and collimator, for detecting and measuring very small deviations in a beam of light.
Found on
https://www.infoplease.com/dictionary/autocollimator
No exact match found.
