6x13 opperating mechanism is largely a scaled up version of the 45x107. The
slide lifting fingers and tray indexing system are the same. However, there
is no need for the center label viewing mechanism seen on 45x107 viewers. The
other major difference is substitution of a roll-up fabrick dark slide for the
45x107's metal dark slide. This is due to height restriction of the cabinet.
The Taxiphote mechanism scales extremely well. Even in its largest 8.5x17 form
it remains smooth and easy to operate.