The following is an article that originally appeared in Popular Mechanics Photo Handbook, 1948 edition, pp 112-113. It was written by Walter S. Marsh.
The only thing they don't happen to mention is that you still have to get the dark. As I mentioned elsewhere, it's not easy to make a room dark enough for photo work. You'd be surprised.
Still, I think this is an interesting project. If I still did enough darkroom work to make it worthwhile, I'd build the thing myself.
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