. The silver sunbeam : a practical and theoretical text-book on sun drawing and photographic printing. MISPLACEMENT OF LENSES. 561 Misplacement of Lenses. It frequently occurs that photographers, after separatingthe combinations of lenses for cleansing and other purposes, meniscus, and C the crown lens of the back combination, intheir proper positions. This will enable those who are in trouble to determine forthemselves if their lenses are in proper position or not, andin many cases it will save them express charges. The foregoing rule does not apply to the Dallmeyer lenses,in which the curves
. The silver sunbeam : a practical and theoretical text-book on sun drawing and photographic printing. MISPLACEMENT OF LENSES. 561 Misplacement of Lenses. It frequently occurs that photographers, after separatingthe combinations of lenses for cleansing and other purposes, meniscus, and C the crown lens of the back combination, intheir proper positions. This will enable those who are in trouble to determine forthemselves if their lenses are in proper position or not, andin many cases it will save them express charges. The foregoing rule does not apply to the Dallmeyer lenses,in which the curves and positions of the various lenses areentirely different, and each lens so fastened in its cell thatit is impossible to misplace either of them. misplace The cut is given to showthe correct position of is the front combination,the lenses of which, beinghermetically sealed, are sel-dom misplaced. In fact, wehave noticed that some man-ufacturers fasten the frontcombination in its cell. F represents the flint CHAPTEE LXVI. f PRINTING ON ALBUMENIZED PAPER. Fig. 53. The improved methods of working albumenized paper havemade the results more certain, while the care is very mate-rially lessened. The formula most generally used at presentis as follows : Make a solution of nitrate of silver from thirtyto forty-five grains to the ounce of water. Add a few dropsof ammonia, shake thoroughly, and then allow the precipitateto settle ; decant and add two grains of ammonia-alum toeach ounce of the solution. Float the paper one minute andexpose to the vapor of ammonia as long as may be foundnecessary. In cold weather the solution should be kept at amoderate temperature, and the ammonia box should, if nec-essary, be slightly warmed by placing a h
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