NATIONAL PHYSICAL LABORATORY (C) CROWN COPYRIGHT / SCIENCE PHOTO LIBRARY NATIONAL PHYSICAL LABORATORY (C) CROWN COPYRIGHT / SCIENCE PHOTO LIBRARY
Vertical collimator. Researcher looking through the eyepiece of a vertical collimator. This device is designed to narrow and focus light onto a particular point, in this case the point being observed through the eyepiece. Collimators are used in astronomy, physics and engineering, to make observations and calibrate other instruments. Photographed in the Light Division of the National Physical Laboratory, Teddington, UK.
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