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Bartlett, Albert A.; Thomason, Michael A. – Physics Teacher, 1983
Recommends black chalkboards, wet-washed before every lecture and advocates the use of Railroad Crayon chalk because its softness and larger size result in a wide high-intensity line. The resulting contrast improves the visibility of material written on chalkboards. (Source for the chalk is provided.) (JM)
Descriptors: Chalkboards, College Science, High Schools, Higher Education