. The book of photography; practical, theoretical and applied. warm ; if not, it is ad-visable to warm it. The plate is thenheld by a pneumatic holder, which mustbe warmed befoi^e being used ; or it maybe held in the tips of the fingers, or placedin a flat dish. The first named methodis, however, the best. Sprinkle a littlepowder in the centre of the plate and withthe camel-hair brush spread it as rapidly breathing may be resorted to, but it is a idangerous practice, and liable to produce idirty high lights or a smudgj effect. Itis necessary, however, that the air shouldnot be absolutely dry a
. The book of photography; practical, theoretical and applied. warm ; if not, it is ad-visable to warm it. The plate is thenheld by a pneumatic holder, which mustbe warmed befoi^e being used ; or it maybe held in the tips of the fingers, or placedin a flat dish. The first named methodis, however, the best. Sprinkle a littlepowder in the centre of the plate and withthe camel-hair brush spread it as rapidly breathing may be resorted to, but it is a idangerous practice, and liable to produce idirty high lights or a smudgj effect. Itis necessary, however, that the air shouldnot be absolutely dry and that the powderis kept constantly moving. This opera-tion may be carried out in the dark-room,where the air is generally in a good con-dition for the purpose. As soon as thedevelopment of any part is complete, thepowder may be brushed away, andother parts may, if desired, be allowed todevelop further. In this way the artisticeffects can be greatly heightened. Combination Pictures. The background from one picture andthe figure from another may be combined. Fig. 304.—Simple Actinometek. as possible all over the film. This mustbe kept on the move the whole time, untilall the required detail and density issecured. It will be found on removal fromthe frame that an image is alreadyformed, but this will be where the lighthas acted. As soon as the plate hasbecome quite cold, development may beexpected to commence, and then to pro-ceed fairly rapidly. As it advances, agentle stream of air should be blown withthe mouth across the plate—not so brisklyas to disturb the powder, or so slowly asto cause the moisture of the breath tocondense upon it. In stubborn cases slow
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectphotography, bookyear
