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Even the papers were there, all prepared, and before laying in the printing-frame upon the negatives, it was sufficient to soak them for a few minutes in the solution of nitrate of silver.
Now let me describe how to go to work. I take the negative and place it in the printing-frame, holding it in its place with a couple of tacks, film-side next the lens, just as in printing; then stand the printing frame on its edge on the flat board, and place the ground glass in front of it when I say in front of it, I mean not between the negative and lens, but between the light and the negative.
The remarkable similarity of such a slide to the automatic printing-frame described last week will strike the reader; and, like the printing-frame, it possesses the advantage of speed in working no small consideration to the photographer in a distant, and possibly hostile, country.
If old oxalate developer be exposed in a shallow vessel in a warm place, a deposit of light green crystals will be formed, composed of an impure oxalate of iron. If these crystals be dissolved in water, and paper washed with a strong solution, when dry it may be exposed in the printing-frame, giving full time.
From time to time he made mysterious appearances at the windows of the loft, usually arrayed in what looked suspiciously like a nightshirt. Sometimes I would see him holding a negative up to the light, at others manipulating a photographic printing-frame; and once I observed him with a paintbrush and a large gallipot; on which I turned away in despair, and nearly collided with the inspector. "Dr.
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