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146
CINEMATOGRAPHIC ANNUAL
Troughs for Reel Development
Glazed stoneware and wooden troughs lined with sheet rubber or rubberized cloth are satisfactory for practically all ordinary processing solutions. Lead, Mond, Nickel, Allegheny Metal, Monel, and Corronil metals are satisfactory for use with developing solutions but they are slowly attacked by fixing solutions. For acid oxidizing solutions or strong alkalies, glazed stoneware troughs are recommended but the troughs should be emptied after use. Metal troughs may be used in an emergency if the interior of the trough is lined with pure gum rubber sheeting or paraffined cloth. This latter lining is applied by coating the interior of the trough with cloth and sticking it to the metal with Cumar Resin (medium hard grade) . The cloth is then brushed over with molten hard paraffin wax and the surface finally smoothed off with a hot iron. Metal troughs may also be coated with "Oxygenated Asphalt" but great care should be taken to insure that metal is covered completely and that the coating is free from bubbles. Japanned metal ware is only satisfactory for intermittent use. Piping, Pumps, Faucets, etc.
For transporting developing solutions, hard rubber, iron (not galvanized) , Duriron, and Allegheny metal piping and pumps are satisfactory and should be used in connection with faucets of similar materials. For transporting fixing solutions, hard rubber piping, valves and pumps are recommended. Tinned or tinlined, copper, or brass faucets or piping should be avoided for use with developers or fixing solutions. For conveying distilled water, however, pipe lines and fitting of block tin soldered with pure tin solder are satisfactory. Lead piping joints should be "wiped" or lead-burned, and not soldered. If silver-plated apparatus is used, the plating should be free from pinholes or scratches.
A suitable packing for pumps consists of asbestos rope twisted with the aid of a little hard grease.
Lead and hard rubber piping needs supporting while hard rubber must be protected from blows or excessive pressure.
The following table summarizes the above recommendations.
Construction Materials for Processing Apparatus
Solution
Storage Tanks
Pipe Lines
Racks
and Idlers
Co/7s
Developer
Wood
Iron
Asphalt coated wood
Lead lined wood
Glazed earthenware
Black iron (not galvanized)
Soft rubber
Allegheny
metal Nickel Monel metal
Allegheny
metal Monel metal
Nickel
Monel metal Lead
Hypo not
containing
silver
Wood
Lead
Asphalt coated wood
Glazed earthenware crocks
Hard rubber Soft rubber Lead
Allegheny
metal Monel metal
Allegheny
metal Monel metal
Allegheny
metal Lead
Hypo containing silver
Wood
Asphalt coated wood
Hard rubber Soft rubber
Allegheny
metal Monel metal
Allegheny
metal Monel metal
Allegheny metal
Water
Wood Iron
Galvanized
iron Soft rubber
Allegheny
metal Monel metal
Allegheny
metal Monel metal