” Dr. 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.” Through a master’s divine knowledge of light phenomena, he can instantly
” Dr. 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.” Through a master’s divine knowledge of light phenomena, he can instantly
