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Photogenic Drawing {Ans: A photographic technique developed by William Henry Fox Talbot that used light-sensitized paper to produce a negative from which multiple positive prints could be made. Talbot's Leaf ca 1840 - made with a salt print, which had light sensitive salt on the surface of the paper}Half Tone {Ans: A reproduction of a photograph or other image in which the various tones of gray or color are produced by variously sized dots of ink. (Newspaper) The process whereby photographs may be printed with text in a book, newspaper, or magazine by relief or by lithography. It was called half-tone because it allowed the reproduction of tones between black and white. Applying a principle discovered by Talbot, the half tone uses a fine screen to break up the surface of a print into tiny dots whose size accords with the darkness and lightness of a picture. The screen is printed on a metal plate covered with gelatin mixed with bichromate. The gelatin hardens and the non-printing areas of the image are etched with acid. The half-tone process was used sporadically even before the late 1880's, when it was perfected, allowing newspapers to routinely include photographs. Louis Heller,