Birch, McDonald. McDonald Birch?s Spirit Alarm Clock. Circa 1950. A brass alarm clock resting on a thin wooden tray held in the magician?s hands rings out answers to questions ? chiming once for ?yes? and twice for ?no? on command. With the wooden packing case for the clock. Tray 15? wide. Not tested with batteries. Tray crudely repaired. Likely manufactured by Birch himself, and the first example of this prop in any form we have encountered. With a photograph of Birch performing the trick.