MAKING TRANSPARENCIES.
It has often been said that photography attains its highest perfection and beauty in a good transparency, and this state ment is not without foundation, especially when the transparency is a stereoscopic one. There are two ways of making a transparency. One is by contact printing, and the other by copying in a camera. The latter method is, perhaps, productive of better results, but by adopting the former there is the advantage of sim plicity, no special apparatus beyond a printing frame being necessary. The frame shown by Fig. 834 is somewhat different from the ordinary style. It has an opening A one-third of the entire width of the recess or rebate, in which the negative is placed. Fig. 835 shows one position of the negative and positive plates when inserted into the rebate, and before the back (Fig. 836) has been placed in position. This pattern printing frame is intended for use when a positive is to be made from a stereoscopic nega tive in which the two images have not been transposed. In order, therefore,
that the positive images shall he taken direct on one plate, and in their proper order for the stereoscope, the negative is placed with its edge in contact with one end of the rebate, while the sensitive plate on which the positive is to be printed is placed with its edge in con tact with the opposite end. They will thus overlap each other just opposite the opening A (Fig. 834). The back of the frame is then inserted and the exposure to artificial light made. This done, the negative and positive are made to change positions, as indicated by Fig. 837, when the second half is exposed as before. Needless to say, the negative is placed in the frame first, with its film side upper most, the positive plate being laid on top, with its film side in contact with the negative.