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300 MOTION PICTURE HANDBOOK
temperature for a long time. Therefore, this cap or mushroom is consumed very slowly. The remedy is to knock it off with a screw-driver having an insulated handle, and to be careful not to again allow the arc to get so short.
Side-Lining the Carbons. — It is essential that the upper and lower carbons set exactly straight with each other, viewed from the front — that is to say, through the condensing lens opening, as per A, Fig. 125, in which A shows correct lining; B, top carbon out of line and C both out of line.
Modern lamps have an adjustment by which the carbon tips may be lined with each other sidewise, but if the upper and lower carbons be not in line with each other throughout their length then as they burn away a constant sidewise adjustment of the carbons will be necessary to keep; the crater from moving over to one side.
When the operator takes charge of a plant, or when
^gjjjjijjajk a new outfit is purchased, he
should put in two carbons of equal diameter, line their
Hfc tips exactly sidewise and
wR then, with a straight edge
wk laid against the side of the
•b two carbons, test them for
Ik side line. If either carbon
Rk is out of perpendicular he
W| should carefully file the car
bon clamp until the matter ^L. is remedied. It is no uncom
^k mon thing to find lamps with
|^^^^ W| either the upper or lower
H| Hk carbon, or perhaps both, out
^L ... Hi of plumb sidewise. With
8k Vk some lamps it is possible to
9L • remedy this matter by
jlL loosening the screws which
HL^^jjH hold the carbon arm and
shifting the arm slightly.
.JBHHKl-JLSL. At Fig. 126 is a photo
graphic representation of the
Figure 126. set which I strongly recom
mend for both D. C. and A. C.
In closing the subject of carbons let me impress upon your minds as strongly as possible the following: