Читать книгу A Practical Manual of the Collodion Process. Giving in Detail a Method For Producing Positive and Negative Pictures on Glass and Paper онлайн
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ssss1 represents the front of the frame. The negative glass is held upon it by springs attached by screws to the bottom half of the frame, A, so that they can be turned on or off, to suit the different sizes of glass. On the other end of the spring are wooden buttons, which are placed on the edges of the glass negative, holding it in its place, and pressing it firmly against the paper which is placed under it. This frame is made of two pieces of inch board, which are connected by hinges, falling over as seen in ssss1, B being the half that is movable. This movable half is secured in position by means of a wooden button, attached to A on the back and under B, as seen in ssss1. The separate pieces, A and B, are bevelled where they connect, as seen by ssss1. D (in ssss1) is one of the springs, which can be seen in ssss1.
The entire bed or face of the frame, A and B, should be covered with a thick piece of satinet cloth, which may be pasted to the lower half, A, and extended over the entire surface of A and B. This forms a pad for the paper.