. Motion picture electricity. it is therefore neces-sary to place the curtain above the machine. It is evident that with this arrangement the ordinaryslant of the carbons will be considerably increased by theraising of the front of the lamp house, and therefore ifthe carbons are set in perfect alignment, the crater on thepositive carbon would be forced upwards, making thecrater long and difficult to control. Under a conditionof this sort it is advisable to put the center line of theupper carbon slightly ahead of the center line of the lowercarbon, as illustrated in Fig. 64. Please note, howeve
. Motion picture electricity. it is therefore neces-sary to place the curtain above the machine. It is evident that with this arrangement the ordinaryslant of the carbons will be considerably increased by theraising of the front of the lamp house, and therefore ifthe carbons are set in perfect alignment, the crater on thepositive carbon would be forced upwards, making thecrater long and difficult to control. Under a conditionof this sort it is advisable to put the center line of theupper carbon slightly ahead of the center line of the lowercarbon, as illustrated in Fig. 64. Please note, however,that the crater will not form as in Fig. 64, but, due to thelamp and carbons being tilted backwards, it will form MOTION PICTURE ELECTRICITY 125 higher up, approximately like illustration Fig. 65, whichis a correct representation of how the crater should normal projection where the center of the screenis on a level with the projecting lens, the carbon shouldbe set as illustrated in Fig. 68, which is practically the. Fig. 68 same setting as shown in Fig. 65, wyhich represents theproper crater formation for such projection. This settingmay be considered the best for direct current for generalpurposes. There are, however, other conditions to meet. For in-stance, where the machine is placed considerably higherthan the screen, as would be the case in a regular theaterwhere it is necessary to place the machine in the front ofthe balcony. Under this condition the machine is muchhigher than the screen, making it necessary to tilt thetable, lamp house, and machine forward to a considerabledegree, as illustrated in Fig. 69. Under this conditionthe angle at which the carbons are put, in relation to thevertical or plumb line, is considerably decreased; as amatter of fact, the placing of the machine in this positionmay put the carbons in a perfectly vertical position, which,of course, is not right for direct current. In order to coaxthe arc forward, it will be necessary to put th
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Keywords: ., bo, bookcentury1900, bookdecade1910, bookidmotionpictureele00hall
