Practical cinematography and its applications (1913)

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66 PRACTICAL CINEMATOGRAPHY about 6 inches in depth. These trays may be made of wood throughout, with dove-tailed sides, and tongued and grooved bottom, or the bottom may be made of glass. If the work of dove-tailing seems too difficult, the sides and bottom need only be nailed or screwed together, but in this case a lining of waterproof fabric should be fixed to the wood. Trays of this type are inexpensive, and are quite as good as those of a more elaborate character. In some developing works lead-lined trays are used, but they are weighty and cumber- some to handle. In order to draw off the solution when necessary it is well to fit a drain and plug in the bottom of the tray by which the contents can escape into the storage vessel placed beneath the bench. Sometimes a vertical tank is used. This system is maintained to be the most satisfactory as it enables the solution to be kept more easily in movement. The tank, in this case, should be 33 inches high by 33 inches wide, and 6 inches from front to back. These are inside measure- ments. It must be lined with waterproof material or with thin sheet lead in the same manner as the tray. For the purposes of the small worker, the tank process is more expensive, owing to the greater quantity of solution that it requires; so, for ordinary and limited working, the tray is recommended. It should be fitted with a rocker