References
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- Kappauf , W. E. Jr. and Smith , W. M. 1951 . A preliminary experiment on the effect of dial graduation and dial size on the speed and accuracy of dial reading . Ann. N. Y. Acad. Sci. , 51 : 1272 – 1277 .
- Leyzorek , M. 1949 . Accuracy of visual interpolation between scale markers as a function of the separation between circular markers . J. Exp. Psychol , 39 : 270 – 279 .
- Loucks , R. B. 25 November 1944 . Legibility of aircraft instrument dials: The relative legibility of various climb indicator dials and pointers 25 November , Army Air Force School of Aviation Medicine, Randolph Field, Texas, Report No. 1, Project No. 286