. The book of photography; practical, theoretical and applied. e is scarcely anart or an industry that is not indebted toit, directly or indirectly. Value of Photographic Knowledge. The man or woman who wishes to beperfectly equipped in these competitivetimes, when everyone is eager to takeadvantage of all the assistance thatscience and technical training can confer,should have at least a slight knowledge ofphotography. It is sure to be of use at was invented by Giambattista della Porta,generally spoken of as Baptista Porta,of Padua, in 1569; although there is evi-dence of an even earlier know
. The book of photography; practical, theoretical and applied. e is scarcely anart or an industry that is not indebted toit, directly or indirectly. Value of Photographic Knowledge. The man or woman who wishes to beperfectly equipped in these competitivetimes, when everyone is eager to takeadvantage of all the assistance thatscience and technical training can confer,should have at least a slight knowledge ofphotography. It is sure to be of use at was invented by Giambattista della Porta,generally spoken of as Baptista Porta,of Padua, in 1569; although there is evi-dence of an even earlier knowledge of itsprinciple and properties. This simpleinstrument depends in principle on thefact that if a tiny hole is made in theshutter of a room, from which light isotherwise excluded, a small reversedimage of the view outside will, underfavourable conditions, be thrown on theopposite wall. This experiment appearsto have been known to philosophersfrom time immemorial, but it was nottill later that the improvement effectedby using a convex lens in place of the. Fig. 1.—Guyots Camera Obscura. one time or another, and may be perhapsof the very highest value. Even when thestudy of photography brings no monetaryreturn, a great amount of pleasure andrecreation is derived from the pursuit ofwhat seldom fails to become a most fascin-ating hobby. Eakly History of may be described as theoffspring of optics and chemistry. If thecamera obscura had not been ready tohand, to cast a miniature picture on thesensitive plate or film, the discovery ofthe actinic power of light on certainsubstances would have been valueless,except as a scientific curiosity. Thecamera obscura (Latin = dark chamber) hole was discovered. The idea of en-closing the lens in a small box, with ascreen of tracing paper or ground glass,first occurred to Porta, as already stated,in 1569. The box form of camera obscuraappears to have been used as an enter-taining toy, or as a ready means of tracingla
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