Photography in Colours a Text book for Amateurs And Students of Physics With
Photography in Colours a Text book for Amateurs And Students of Physics With
George Lindsay Johnson
The book Photography in Colours a Text book for Amateurs And Students of Physics With was written by author George Lindsay Johnson Here you can read free online of Photography in Colours a Text book for Amateurs And Students of Physics With book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is Photography in Colours a Text book for Amateurs And Students of Physics With a good or bad book?
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26), lingers until replaced by the second one, B, and the second one is again replaced by a third one, C, and so on. We have suggested this in the diagram, in which the height of the curve represents the intensity of the light stimulus, and the width or base the time. FIG. 26. Curve representing the four periods 'of a visual sensa- tion. The first sensation is represented by a thick line, the two succeeding ones by dotted lines. 1. Short latent period ; 2. Period of increase to maximum ; 3. Lon...g period of per- sistence of sensation with gradual decline ; 4. Period of rapid fall and obliteration of the sensation. In reality the sensations overlap very much more than here shown, but they are separated in the diagram for the sake of clearness. This explains why, when a lighted stick is whirled round, it forms an unbroken circle of fire, and why a stream of water allowed to drop from a pipe appears to form a continual stream, and not a series of droplets, as is really the case ; and' just as the first impression of a moving object melts into the next one, so a series of colours pass before the eye, as in the familiar colour-top 206 PHOTOGRAPHY IN COLOURS which carries a card divided into sections painted blue, green, and red.
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