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MANAGERS AND PROJECTIONISTS 1059
condition. C is a lamp, the filament of which is badly sagged ; also its globe is somewhat blackened by deposit. It is worse than foolish to keep lamps in use until they get into such condition as shown in B and C, Fig. 394.
The man who takes pride in his work and values high grade service above his own ease, will remove his exciting lamp, polish its outer surface and carefully examine the glass for discoloration and the filament for signs of sagging.
It is very poor business to try to "save" a few cents in exciting lamp cost, when by so doing you must and will inevitably work injury to the sound. Discard exciting lamps the moment they show any signs of filament sagging or discoloration of the globe. These defects not only lower the sound volume, but also injure the sound quality.
In considering the results of filament sagging it will be well to remember that this light source is used to project a very thin line of light, described elsewhere, and that a horizontal line in its beam representing the center of the filament will carry the greatest illumination value. If this be true, and you may readily see that it is, it then follows that if the filament be sagged in any degree, no matter how slight, the most brilliant line of illumination cannot possibly be exactly adjusted upon the slit.
A TEST. — I promised I would tell you how to make a really practical test for sidewise adjustment of the slit image upon the film sound track, in order to make certain it is not too far to the right or left. To do this you must obtain some Eastman negative film. Ten feet should last you quite a long while. I think likely you may get it from either Fox-Case Movietone, Tenth Ave