question about kodak 2D back

[Jim collum]

disassembling the camera today.. i noticed something I couldn't figure out.
on the rear camera back, on the inside of the film plane/ground glass, there's a slot routed out the horizontal slots in one plane, the vertical in another. On one side of each of the horizontal and vertical, there's a spring inside the slot (as if to hold something in under tension.

What were these used for?

jim

[Jon Shiu]

These are for removable splitter board or slider boards, ie to expose one half of the film area at a time.

Jon