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CINEMA PROGRESS
asking for a demonstration in the room where the projector is to be used. In such a demonstration it is well to give special attention to the following points :
1. ILLUMINATION:
a. Does the projector give sufficient brilliancy to make the picture the required size?
b. The damp should not be run at more than its normal rating.
c. The film used should be of average or more than average density. For example, cartoons and snow scenes arc unsuitable for this purpose.
d. The screen used should be of this same type which it is proposed to buy. If the screen is silver or beaded it is necessary to observe both from the normal position and the worst placed seat.
e. The -room should not be more thoroughly darkened than will be the situation in actual use.
2. PROPER LEXS:
a. If the projector has to make a very long throw or a very short one, it is well to make certain that the projector may be fitted with proper lens.
b. If prolonged shows are to be given, it is well to be certain that the projector will carry an oversize reel. The 16-mm. machine carries a normal reel of 400 feet. Oxersize reels carry 800, 1200, and 1600 feet of film. The oversize reel will eliminate loss of time necessitated by changing the reel.
c. Where high lamp wattage is desired, bear in mind that high lamp wattage is not necessarily equivalent to high light output, and that
high wattage lamps entail increased cost and running expenses.
3. QUIETNESS:
a. In the demonstration, note the amount of mechanical noise; excessive noise will detract the attention of the audience and especially those seated near the projector.
4. STILL PICTURES:
a. For classroom purposes the teacher may desire to show a still picture. It is desirable to have a machine which permits one to turn the film forward or backward by hand ; incidentally this will be a convenience in threading the machine. This feature is found only on certain machines.
5. CARE OF PROJECTOR:
a. It is desirable in any projector that the inside of the gate should be easily accessible for cleaning purposes; otherwise attempts to clean it may result in scratching the faces of the runners, which will increase the tendency of the film to deposit cakes of emulsion there.
6. SOUND PROJECTORS:
a. In choosing a sound projector give -pecial attention to the volume and quality of sound.
b. Be certain to test the machine under the actual conditions of use, for acoustic properties differ with the room.
c. In selecting a 16-mm. sound projector capable of running at silent speed it should be noted that alterations to the shutter blade may be involved when the speed is changed. It is important that these alterations should not be difficult to carry out.
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