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Dark-room clock

Dark-room clock
Timing is an essential factor in any dark-room. Keeping a constant eye on the clock while the photograph is being developed, however, is a nuisance, and makes it impossible to attend to other activities. The low-cost timer described here can be programmed to give accurately timed audible signals as areminder to flip the development tank, add the fixative, remove PE paper, and so on.
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