NATIONAL PHYSICAL LABORATORY: SCIENCE AND TECHNOLOGY IN WARTIME, TEDDINGTON, MIDDLESEX, ENGLAND, UK, 1944 - A scientist in the Optics Section of the Light Division at the National Physical Laboratory, Teddington, tests the angular scale of sextants using a large circular piece of equipment, which, according to the original caption, "is supported on steel pillars resting on foundations independent of the rest of the building"

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