A cord passes from
either end of this bar through cam shaped clamps, which were originally
designed for clamping the cords of curtains with spring fixtures. These
clamps are cheap. They are easily and quickly adjusted, and are very
secure.
The whole apparatus can be located upon the roof of a building, or, if
convenient, it can be mounted upon slides, and pushed through an open
window when it is to be exposed to the light. If it is to be used upon a
roof, a small hut, or shelter of some sort, near by is a great
convenience to the operator, particularly in winter.
_An Inexpensive Drying Case for Use in Coating the Paper._--When the
apparatus is in continuous use, time may be saved by having a convenient
arrangement for drying the sheets that have been coated with the
sensitizing liquid. I have made an inexpensive drying case which serves
the purpose very well. It consists simply of a light-tight rectangular
case of drawers. There are twenty-five drawers in all. They are
constructed in an inexpensive manner, and are the only parts of the case
that are worth describing. They are very shallow, being but 1-7/8 inches
deep, and as it appeared that the principal expense would be for the
materials of which the bottoms of the drawers should be composed, it was
decided to make the bottoms of cotton cloth. This cloth is stretched
upon a frame, the dimensions of which are greater than that of the paper
to be dried.
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