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BRITISH KINEMATOGRAPHY
Vol. 16, No.
minute, is by suction. It requires about 2 h.p. to blow the film clear of water, but only 0.1 h.p. to suck it off.
The Drying Cabinet
The machine can be set up with any type of drying device :— a cabinet with warm air or radiant heat, a drum with hot air or radiant heat, etc., provided only that the drying unit supplies the effort for pulling the film through the tanks. So far, we have only required the warm-air cabinet that is shown in the illustrations. In order to conserve heating power, the air can be entirely or partly recirculated, depending on the rate at which water is carried into the cabinet.
The fan, of variable speed, draws the air through the heater mats (six 360-watt
CIRCULATION
•
PUMP ORCUL GAS AGITATA
-ATION
|
o
GAS-LIFT CIRCULATION
4=
u
r
GAS AGITATION WHEN NO OUTLETS ARE AVAILABLE
TEMPERATURE CONTROL
d-[
4EAT-EXCHANGER U-TUBE WITH HOT ELECTRIC HEATING ANO COLD WATER AND COLD WATER
COUPLING
w-r
Tig. 6.
Fig. 7. Modified form of Some typical methods of achieving circulation, tank rack suggested for agitation, and temperature control future machines
units), and pushes it into the drying compartment. The air rises through the drying compartment and returns down the back of the cabinet. The setting of the inlet and outlet louvres, and of the damper, control the proportion of the air that is recirculated. The lengths of the loops in the drying cabinet can be varied.
Film Drive
The film drive on the existing cabinet is obtained by wrapping the film about two-thirds of the way round a hard rubber roller and nipping it with a springloaded pressure roller (Fig. 5). Two ranges of film speeds, 3 ins. to 5 ft. per min., and 5 ins. to 15 ft. per min., are obtained by a gear change, and variation