Abstract
Two developing machines for laboratory use have been designed and constructed to approximate some of the development characteristics frequently encountered in commercial practice. They are arranged to accommodate only small quantities of film, but rapid film motion is attained by splicing the films into a loop, thus permitting reasonably high linear speeds. — A photoelectric densitometer was constructed which is in use as a secondary standard of density measurement, the mechanical features of its design affording good reproducibility and rapid operation.
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