. Motion picture electricity. d to burn veryunsteady. If the carbons are held too close together, es-pecially when new carbons are put in, the arc is likely togive a waving light, dying down and coming up remedy is to move the arm of the field controller toa lower point and separate the carbons a little bit. Neverhold the carbons too close together for any length of time,as this will destroy the carbon points and cause unsteadylight. It is better to let the arc be a little longer than alittle too short, at least until you have secured perfectlysteady burning. In a days operation, an
. Motion picture electricity. d to burn veryunsteady. If the carbons are held too close together, es-pecially when new carbons are put in, the arc is likely togive a waving light, dying down and coming up remedy is to move the arm of the field controller toa lower point and separate the carbons a little bit. Neverhold the carbons too close together for any length of time,as this will destroy the carbon points and cause unsteadylight. It is better to let the arc be a little longer than alittle too short, at least until you have secured perfectlysteady burning. In a days operation, an operator sooncatches on to just the best way in each instance to secureproper results, and this information cannot be impartedin detail by any instructions from the maker. MOTION PICTURE ELECTRICITY 207 For detailed instructions as to the care of the commu-tator, etc., see instructions given for d. c. to d. c. HallbergEconomizer. One thing of importance which should beremembered in the care of the machine is that it is always. well to operate the brushes with the least spring tensionwhich will give sparkless commutation. A stiff brushspring causes the brushes and commutator to wear exces-sively and at the same time is the cause of excessive heatat the commutator, due to friction. Stiff spring tension 203 MOTION PICTURE ELECTRICITY does no good and is a great detriment, therefore, takecare that the spring is in the weakest notch, which willgive sparkless commutation, and this is generally in thefirst or weakest notch. The notches further back which incline to increase thetension of the spring should never be used unless thespring itself has become weakened by age. This is an-other point in which the judgment of the individual op-erator will have to be depended upon. Fig. 115 illustrates a specially constructed switchboardfor use in the operating room where the current is sup-plied by the Hallberg A. C. to D. C. Economizer. Thisparticular illustration shows the double lamp contro
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