With the case in a well lighted room, I
should prefer to have outer doors to the case, made of ordinary board
six or eight inches wide, hinged to one end, and arranged to swing
horizontally across the front of the case. These would more completely
prevent the admission of light. The opening of any one of the doors
would allow three or four of the drawers to be filled, while the rest of
the case would be comparatively dark at the same time.[2]
[Footnote 2: Since this paper was read, I have seen in the
office of the City Engineer of Boston a drying case which is
similar in some respects to the one that I have devised. It has
been longer in use than my own. The drawers are simply the
ordinary mosquito netting frames covered with cotton netting.
They have no fronts, but a door covers the front of the case,
and shuts out the light.]
_The Portfolio for Protecting the Sensitized Paper from Exposure to
Light._--The sensitized paper is very well protected from exposure to
light, if kept in a portfolio or book, the brown paper leaves of which
are considerably larger than the sensitized sheets. The sheets may be
returned to such a book after exposure, and washed at the convenience of
the operator. They can be washed more quickly and perfectly if _two_
water-tanks are provided in which to wash them. A few minutes' soaking
will remove nearly all of the sensitizing preparation which has not been
fixed by the exposure.
Pages:
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89