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1948 G-3 FILM-PROCESSING TANK 483
in complete darkness (or. in the case of certain special films, with a proper safelight).
A feature of the G-3 tank is the fact that, regardless of room illumination, the interior of the tank is completely dark so long as the tank and window are both covered. This light-tight feature permits much of the processing to be done with the operator working in a well-lighted room.
The point at which it becomes safe to expose the film to any light occurs when the film has been thoroughly desensitized by the fixing solution or special desensitizing solutions.
C. Loading the Tank
Remove the cover and both reels from the tank. Make sure that the entire system (tank, cover, reels) is clean and dry, that both reels are properly adjusted, and their film slots are in the open position.
Place the camera spool containing the film (not a G-3 reel) on the spindle on the right-hand side. Orient the reel in such a way that it >will unwind counterclockwise.
Insert about an inch of the loose end of the film in the slot of one of the G-3 reels, clamp the slot, and place the reel on the left spindle.
Rotate the right reel clockwise so that it winds up any film that is either loose or wound on the left reel. Check to see that the film is not twisted or off the reel. To ensure a natural, unstrained setting for the film, open the film slit of the left reel and rotate that reel two or three turns clockwise. Then close the film slit.
Transfer the film to the left reel by rotating the left reel clockwise. This can be done either with or without the cover on the tank. If the cover is used, the operator can use the crank and can illuminate the room. (Be sure that the tank and its window are covered before the room lights are turned on.)
Fig. 6 illustrates the method. Note that this operation turns the film ' 'inside out"; that is, the film is wound on the left reel with its emulsion side out (an important requirement), whereas it normally comes off of the original reel with its emulsion side facing in.
When the film has been completely transferred to the left reel, remove the right reel. Insert an inch of the loose end of the film into the slot of the second G-3 reel and clamp the slot.
Place the reel in the tank over the right spindle, taking care to insert the connecting film between the window and the roller. Rotate the left reel clockwise until it takes up any film that is loose or