PHOTOGRAPHIC PROCESSING TANKS

摘要

A film holder for use in a photographic developing tank, the holder including a central column (1) and a pair of annular plates (5) mounted in spaced-apart relation on the column. Each plate includes a number of radially-extending support ribs (9) which carry a spiral rib (11) forming a spiral channel to receive the film. The rib has an elongate cross-section with a first portion (15) which tapers inwardly in the axial direction facing towards the other plate, and a second portion (17) which tapers inwardly in the axial direction facing away from the other plate.