pentaxuser,
I don't have a manual, but I found the following description of the device in question. I never thought the English language could be molded into something so concise and highly informative
. It's a real gem of a sentence.
"A multiprint easel, comprising a photographic paper supporting base, provided with a raised rear edge, and slots extending parallely in and perpendicularly adjacent to a side of the base, within which spring loaded holding tabs are movably accommodated, which, together with upwardly projecting stationary tabs disposed at a base side oppositely thereto, are intended for insertion and holding of the paper on the base; a frame, mountable over the base, and panels accommodated, respectively, horizontally and vertically slidable therein, causing an opening to appear between the panels however they are manipulated on the frame; an insert placeable within and covering the opening of the frame."