NATIONAL PHYSICAL LABORATORY: SCIENCE AND TECHNOLOGY IN WARTIME, TEDDINGTON, MIDDLESEX, ENGLAND, UK, 1944
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A scientist in the Optics Section of the Light Division at the National Physical Laboratory, Teddington, looks through a microscope in order to read the measurements taken by this high precision spectrometer. The spectrometer is used to measure refraction and high precision angles, and the microscope is needed because the gradations used as are so fine.