| http://www.w3.org/ns/prov#value | - Apparatus for testing the resistance of samples of various materials to light and weathering, comprisinga sample testing chamber (10) defined by a housing wall (8), lamps (2) disposed in said chamber and simulating the effect, on samples, of radiation, including sunlight, said samples being rotatably arranged in a plane in said chamber, a sensor (15) disposed in the plane of, and rotatable with, s
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