The PDD onto which the crosshair is projected is coupled to standard personal computer (PC) 107 and is comprised of a multitude of photodiodes 301 and associated circuits, the photodiodes being evenly spaced and arranged to form a frame that can be mounted on the computer display so as to su...
369), claimed was based on a previous test from Thorndike, but this test seems to have remained unpublished) and the Geometrical Construction subtest (based on form boards, which date to the 1800’s; see [43], p. 13). The two remaining subtests (Cube Analysis and X-O Series) were ...