Whisk dust off with a soft brush, polish lenses and remove bits of film.    Little   oiling   is   required

Still projectors contain as many as four ot five concentrating lenses which must be polished very often.
 
Keep 'Em Clean" is the best advice  concerning both still and movie projectors. This applies especially to the reflecting and condensing lenses that concentrate the light on the film. Because of the heat of the latter, they attract a lot of dust. Breathe on the glass lightly, and then polish with a soft, well-washed out rag.

Projection bulbs run so hot that the glass often melts and starts to bulge. The better projectors are equipped with a small fan that starts when the bulb is turned on. Don't over oil this motor, or the drive motor of a movie machine.

In a movie projector, bits of film torn from between sprocket holes have a habit of fouling up the drive mechanism. Clean the latter frequently—after each use, in fact—with a soft brush. The job takes a few seconds and is well worth while. ·

Brush  interior  of projector  with a soft brush  to remove dust. The blower fan needs little oiling.

Keep the various film gates and guide of motion picture   projector   clean   of   torn   film   particles.First step in disassembling an iron is to remove handle for access to the heat control knob just underneath. Nut-and-bolt assembly might be corroded because of heat of iron. Loosen it with a drop or two of penetrating oil. which will help.

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