We use Optical Character Recognition (OCR) during our scanning and processing workflow to make the content of each page searchable. You can view the automatically generated text below as well as copy and paste individual pieces of text to quote in your own work.
Text recognition is never 100% accurate. Many parts of the scanned page may not be reflected in the OCR text output, including: images, page layout, certain fonts or handwriting.
a broken tooth in one of the gearwheels. Check the lubrication, and see also that a bent spool is not the cause of the trouble.
To re-engage a take-up arm without stopping the show; first spin the spool in the same direction but faster than normal, then gently re-engage the arm, but keep up the spinning and then gently slow down until the motor "takes over/'
Serious damage may result if the arm is re-engaged without the spool spinning slightly faster than the normal rate, but do not attempt this unless you are quite sure you know how.
(B) On projectors fitted with a belt drive the most frequent cause of failure is due to the wire belt slipping, which may be due to slackness or the presence of oil.
Another cause may be that the friction device within the head is worn, or perhaps it requires adjusting according to the size of the spool you are using. The groove in the outside rim of the pulley may also have become too smooth with continual wear, and with the result that the wire belt fails to grip, but this is usually a fault found only in old machines. Bent spools may also cause trouble, and they should not be used on the take-up.
Shutter "Ghost"
This applies to white streaks appearing on the screen, and is due to displacement of the shutter on its spindle. Fig. 32.
It cannot be corrected under five minutes except by an expert. A top ghost is due to the shutter being retarded and a lower one due to it being advanced. (See that the edges of the aperture are not too shiny) .
FLICKER BLADE
y^MA5TEk BLADE SILENT-SPEED SOUND-SPEED SOUND OR. SILENT
SHUTTEH SHUTTER. ACCORDING TO SPEED OF SHUTTER*
Fig. 32
VARIOUS SHUTTERS AS USED IN NARROW-GAUGE PROJECTORS
Feed-Spool Tensioning Weak
It is quite simple to prevent "freewheeling" of the feedspool should the tensioning or braking-device fail. Assuming
130