The vertical-horizontal illusion; an experimental study of meridional disparities in the visual field (1917)
Ritter, Sarah Margaret · Princeton, N.J. and Lancaster, Pa., Psychological review company · leaf 15
THE VERTICAL-HORIZONTAL ILLUSION 5 vertical, etc. Also for convenience the 40 variable and standard bars will be … upon the attention. The variable line had a range in length from a minimum of 10 mm. with the shortest standards to 295 mm. for the longest. The standard lines used ranged from 22.5 mm. to 260 mm. in length. That adopted as the normal was 140 mm. The visual angles subtended ranged from 1° ig' for…
Optical illusions
Internet Archive · Princeton Theological Seminary Library · Public domain (published before 1931). Free to use for anything.
