. The silver sunbeam : a practical and theoretical text-book on sun drawing and photographic printing. along the top of the subject—this generally happens most when long exposures are ne-cessitated, as in interiors, etc. The cause is the accumu-lation, at the bottom of the film during exposure in thecamera, of a band of drainage which obstructs the actionon the film. Drain more closely, and connect the piecesof blotting-paper at the corners with that behind the glass,so as to attract, or suck off, the super-abundant subject has a vigorous deposit on the lights, but theshadows are
. The silver sunbeam : a practical and theoretical text-book on sun drawing and photographic printing. along the top of the subject—this generally happens most when long exposures are ne-cessitated, as in interiors, etc. The cause is the accumu-lation, at the bottom of the film during exposure in thecamera, of a band of drainage which obstructs the actionon the film. Drain more closely, and connect the piecesof blotting-paper at the corners with that behind the glass,so as to attract, or suck off, the super-abundant subject has a vigorous deposit on the lights, but theshadows are too much filmed over to be bright andtelling. It cannot be over-exposed, or the lights wouldnot be so vigorous; it most probably, particularly if work-ing with a double lens, arises from diffused light or reflec-tions. It would doubtless be more advantageous that the lensand camera should be so enclosed that the lens, throughan aperture, should see only the subject, thereby avoidingall reflections from surrounding light objects and givingthe purest definition of which it is capable; but this, in. Fig. 10. of the above will be aggravated,if, in taking the slide from thecamera, it is not carried in thesame sense in which it stood, buttilted or reversed; or if the flap,after the picture is taken, is tooviolently closed, which has theeffect of splashing the liquid col-lected in the groove upward overthe subject. As with prolonged failures; their origin and remedies. 463 practice, especially out of doors, is found troublesome, andloses much time. A much larger and deeper brass shade than is usuallysold with each size of lens, diaphragmed or lined withblack cotton velvet (a great absorbent of light) answersevery purpose; and has the advantage of allowing theoperator much more freedom of action in placing his cam-era, while the shade being on the lens, follows its move-ments, when it may be necessary to shift its position inthe field, by altering the sliding fronts. Stains of develo
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Keywords: ., bookcentury1800, bookdecade1870, bookidsilversunbeampra00towl1
