. The silver sunbeam : a practical and theoretical text-book on sun drawing and photographic printing. 544 PROCESSES OP MB. T. C. ROCHE. This will bring the negative up to a good printing color, andwill not change. Dry and varnish. Keep your shield and box free from dust in working, andtake an interest in your apparatus. Cameras and Lenses for Field Work. Fis»18- One R success view cam-. era, with double swing backand folding bed, for eight byten plate; one Dallmeyer wideangle rectilinear ; one Dall-meyer rapid rectilinear. By taking off the frontcombination from either youlengthen the focus,
. The silver sunbeam : a practical and theoretical text-book on sun drawing and photographic printing. 544 PROCESSES OP MB. T. C. ROCHE. This will bring the negative up to a good printing color, andwill not change. Dry and varnish. Keep your shield and box free from dust in working, andtake an interest in your apparatus. Cameras and Lenses for Field Work. Fis»18- One R success view cam-. era, with double swing backand folding bed, for eight byten plate; one Dallmeyer wideangle rectilinear ; one Dall-meyer rapid rectilinear. By taking off the frontcombination from either youlengthen the focus, and canget a larger view. For Stereoscopic Work. One eight by five Z successcamera box, one pair Dall-meyer wide angle rectilinear,two and a half inch focus, onepair Dallmeyer rapid rectilin- ear, and one pair Dallmeyer four and a half quick-actingstereoscopic landscape lenses. Fig. 19. CHAPTEE LXV. DEFECTS AND BEMEDIES. 1. Fogging. Fogging arises from various causes, which generally areeasily detected. A fog which is uniform over the plate, andcan be readily rubbed off with the finger, is caused by thecondition of the chemicals. The fog caused by improperaction of light on the plate de-velopes in the film, and not on Flg 20* the surface. This rule willgenerally indicate to the oper-ator in what direction to lookfor the cause. The intrusionof light may be through smallholes in th
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