1952 Stereo Realist (built 1947-71)
Stereo camera - David White company
You can see stereo pairs by relaxing your eyes about 18" (45 cm) away
from the screen (some people say go cross-eyed). It takes some practice
but you will see multiple images and can move the two center images
together to make a single, 3d image. Try looking at different sizes and see
what works best and try moving further back. Picking out some distinct
feature to "merge" in your minds-eye helps.
Several web browsers let you zoom your browser in and out with
CTRL-mouse wheel which changes photo sizes and that might help.