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They are non-reciprocal optical devices
What is BS EN 15154-2- Plumbed-in eyewash units about
Incorporation of testing of concentric balanced flue systems
ISBN 0 580 25766 5
Paper and board. Measurement of specular gloss - 75 degree gloss with a converging beam, TAPPI method Ingestion-build-260237 They are non-reciprocal optical devices1 Scope This part of ISO 8254 specifies a method for measuring the specular gloss of paper at an angle of 75 to the normal to the paper surface. Although its chief application is to coated papers, it may also be used for glossy uncoated papers such as supercalendered papers. NOTE 1 This method does not provide an assessment of image reflecting quality and should not be used for cast coated, lacquered, highly varnished or waxed papers or for high gloss
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