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HANDBOOK OF PROJECTION FOR
INSTRUCTION NO. 43— ADJUSTING 6B TAKE-UP TENSION. — The 6B take-up consists primarily of two friction discs, which are held in contact by means of a coil spring. One of these discs is faced with fibre, which assures an excellent frictional contact. The driving disc a, Plate 11, is left free to revolve around take-up spindle b, as an axis. The driven disc c, is fastened to spindle b. By frictional contact, motion is transmitted from disc a, to disc c, and thus spindle b is caused to revolve also. The take-up reel fastens to spindle b at d. The reel is held firmly on the spindle by means of catch e. When the catch is in a horizontal position, it is in exact line with spindle b, thus making it very easy to put the reel on, or take it off the spindle. Spindle b runs in ball bearings f, which eliminate all unnecessary friction in operation.
The friction between discs a and c may be adjusted by increasing or decreasing the tension on spring g. This may be accomplished by simply giving a few turns in either direction to collar h, which is threaded on the end of spindle b. When the desired tension has been secured, the collar may be locked in place by means of set screw i.
INSTRUCTION NO. 44— THE LAMP.— The lamp should not be allowed to become dry from lack of lubrication. It is next to impossible to properly handle the light using a dry lamp. Once a week apply sparingly a little lamp lubricant on all movable parts, such as threaded adjusting gears,
Plate 11, Figure 245.