Three-Dimensional Photography - Principles of Stereoscopy

80 THREE-DIMENSIONAL PHOTOGRAPHY

Many stereographers use a diamond point and cut glass nega-
tives in a similar way. Obviously when this is done the printing
requires only a single exposure as when printing an ordinary nega-
tive. This is a distinct advantage when printing upon paper, as
paper has not sufficient rigidity to make its use in the transposing
frame practical.
Print transposition. Some stereographers make their dual prints
from the untransposed negatives at a single exposure, then cut the
prints apart and mount them singly after transposing. This is the
most difficult method as it means that every print must be indi-
vidually transposed and that print alignment must be preserved
during the process of mounting. Both rubber cement and thermo-
plastic mountains are difficult, because the prints are inclined to

Fig. 5-6. Stereo Realist mounting kit. The case

includes at upper left, the heater; center, film

forceps and sealing iron; right, film cutter. Low-

er left, the sorting box for films and lower right,

the mounting jig.