. Motion picture electricity. or adjustabletype. On page 148 you were advised how, within one re-sistance box or rheostat, several resistance units of likeor unlike capacity can be combined and by the manipula-tion of switches, almost any degree of current strengthcan be obtained for either series or parallel (or, as it isalso called, multiple) connection. Before proceeding further I want to state that the samerheostat may be used for either a. c. or d. c, but it mustbe remembered that a given rheostat will pass from ten 152 MOTION PICTURE ELECTRICITY to twenty per cent, more amperes when used
. Motion picture electricity. or adjustabletype. On page 148 you were advised how, within one re-sistance box or rheostat, several resistance units of likeor unlike capacity can be combined and by the manipula-tion of switches, almost any degree of current strengthcan be obtained for either series or parallel (or, as it isalso called, multiple) connection. Before proceeding further I want to state that the samerheostat may be used for either a. c. or d. c, but it mustbe remembered that a given rheostat will pass from ten 152 MOTION PICTURE ELECTRICITY to twenty per cent, more amperes when used on a. c. Thisis providing the line voltage is the same for both increased current is due to the fact that the a. c. arcgives best results at 35 volts as compared with the d. at 50 volts. Single Multiple.—Fig. 89 is a diagrammatic illustra-tion of an ordinary 25-ampere rheostat for a 50-volt pro-jector arc lamp operating on no-volt line. This rheostat 60 V RHEOSTATFOR 25 AM?. 11 WITH 0 V. LINE 50 VOLT ARC. TO 110 /^?n VOLT A< Fig. 89 -© @-
Size: 1503px × 1663px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bo, bookcentury1900, bookdecade1910, bookidmotionpictureele00hall
