. The American annual of photography. the negative. Appreciating how much a sky withclouds adds to the appearance of a landscape, and not wishingto be obliged to substitute clouds I begun to cogitate whethersome means cofild be devised to modify the admission of lightthrough the lens. Taking as a basis that the rays reflected by the part formingthe sky are a great deal more powerful than those reflectedby the ojects in nature, it is evident that the sky should impressthe plate more intensely than the objects of nature in thesame space of time, hence the clouds outlined on the negative,being in
. The American annual of photography. the negative. Appreciating how much a sky withclouds adds to the appearance of a landscape, and not wishingto be obliged to substitute clouds I begun to cogitate whethersome means cofild be devised to modify the admission of lightthrough the lens. Taking as a basis that the rays reflected by the part formingthe sky are a great deal more powerful than those reflectedby the ojects in nature, it is evident that the sky should impressthe plate more intensely than the objects of nature in thesame space of time, hence the clouds outlined on the negative,being in fact over-exposed, blend and are lost entirely withthe rest of the sky. I believe to have found the remedy toobviate this difficulty by modifying the opening of the shutter,a simple guillotine shutter (drop shutter). The frame of the shutter that fits on to the lens and onwhich the working mechanism is placed should have a semi-circular opening; also the dropping slide which makes theexposure, as indicated by the following diagram :. A—Outside frame of shutter. BB—Circumference of lenses. C—Half of the circum-ference covered up, marking half of the lenses. C—The open part of lenses, equal to theother half which is covered. What is the result ? The diagram will furnish the explana-tion. 0 0 K E*
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Keywords: ., bookcentury1800, bookdecade1890, bookpublishernewyo, bookyear1892
