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elements are tight within their mounts, except perhaps, the condenser nearest to the lamp, and that there is no discolouration or cracks. Whitish patches in the lens may be caused by decomposition of the cement which binds the elements together ; do not attempt to rectify such troubles yourself. Lenses may be serviced at little cost by most optical dealers or by the manufacturers.
After cleaning the lenses, wrap them up in paper until you wish to replace them — after you have finished cleaning the rest of the projector.
2. Remove the projector lamp and the amplifier. Brush out the inside of the lamphouse and the space from which you removed the amplifier. Next clean the inner section of the gate and aperture, heat filter, heat plate, shutter and if fitted, the dowser blade. And use only a very soft brush or feather. Next clean, with the proper gate-brush, the gate, lens mount and all rollers and sprockets. You will notice that quite a lot of dirt may be shifted but not entirely removed, so the next thing to do is to re-connect the mains and switch on — the fan should then blow out all loosened dirt.
When you have done that, switch off and disconnect the mains, clean the reflector, clean and replace lamp, replace cleaned condensers and then clean and replace lamphouse cover.
3. The exciter lamp, if fitted, should be examined next. Check that the bulb has not darkened and that the filament has not sagged. Clean, replace and then check its alignment with the sound optics. Dust very gently all exposed parts of the sound optical-system with a feather. Do not use a cloth wrapped around a screw-driver.
4. Examine the motor and if necessary clean the commutator segments. Check the brushes for signs of wear other than normal — cracked, broken or very short brushes should be replaced. But remember that most brushes will last quite a long time and as a rule do not need replacing until they have become too short for proper contact. Ensure also that the springs which hold the brushes down are equally efficient.
Attend to motor-bearings and grease or oil as required by your operators' instructions.
5. After cleaning as much of the projector as you can, you should next go over it very carefully and tighten-up all the
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