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Updated: April 30, 2025
L. T. Troland of Harvard tells us, "are built up on the same principle as the ordinary 'half-tone' engravings; that is, they are made up of minute dottings or stripplings far too small to be detected by the eye. . . . The sensitiveness of the retina is so great that a visual sensation can be produced by relatively few Quanta of the right kind of light."
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