The Dictionary Of Photography

A True Historic Record Of The Art & Practice Of Photography 100 Years Ago.

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a complete and useful piece of apparatus. For this purpose stout, dark-brown American cloth, which is a kind of coarse canvas covered with some coloured waterproof substance, was chosen, and this was tacked on to the upper frame, and the edges brought round to the back of the frame- so as to exclude any stray ray of light which might otherwise creep in ; the shiny side of the cloth was at the back, the woolly side being towards the window. To make absolutely certain that no light penetrated the cloth, ruby paper was pasted on the woolly side of the cloth. At the edges of the frame, where it touched the sashes of the window, a double thickness of woollen list was tacked ; so that,
Fig. 53-
when the frame was inserted in place and secured at the top by a turn button and at the bottom by the catch of the window, there was sufficient pressure on the frame to make it fit up close to the sash and exclude all light. The lower frame was treated in the same way, with this exception, that an aperture was cut in the cloth, and the edges then nailed to the little crosspieces, where the negative is afterwards placed; when these two frames are fitted into the window and the aperture blocked up, there should be no stray streaks of light anywhere. Brown paper, of course, may be used instead of American cloth, but the latter is much more durable, and less likely to suffer accidental damage by the fingers being put through it. Now, let us see as to using a special camera, so that we may not need to darken the room