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  1. NLM Digital Collections - Human factors in military efficiency (Volume 1) 
    Publication: Washington, D.C. : Office of Scientific Research and Development, National Defense Research Committee, Applied Psychology Panel, 1946
    resource.nlm.nih.gov/14030580RX1
    ... in the radium plaque adaptometer test. 3. The clockface adaptometer. This was a modified form of the ... the orientation of a white hand on a clockface which had white markers at 12, 3, 6, ...