We use Optical Character Recognition (OCR) during our scanning and processing workflow to make the content of each page searchable. You can view the automatically generated text below as well as copy and paste individual pieces of text to quote in your own work.
Text recognition is never 100% accurate. Many parts of the scanned page may not be reflected in the OCR text output, including: images, page layout, certain fonts or handwriting.
442
MOTION PICTURE HANDBOOK
Rectifier Terminals
Arc No.2 X
Resistance
Contactor
Plate 6, Figure 219.
picture machine on No. 1, in which case the contactor is closed by hand (cutting out the resistance which is normally
in circuit) at the start and held in this position by a magnet coil. At any time while this reel is running the operator (leaving the contactor on arc No. 2 open) may start machine No. 2 at about 10 amperes, thus allowing the carbon to be warmed up on No. 2, while the reel is still being run on machine No. 1. At the end of the reel on machine No. 1, machine No. 2, with arc
burning with resistance in circuit, is then started; the contactor is closed, thus cutting out the resistance and boosting the current to normal, at the same time short-circuiting the arc of machine No. 1, putting it out, which stops the current flowing in resistance box No. 1, thus opening the contactor. The resistance cannot be accidentally left out when the second arc is struck. W'hen the first arc is short-circuited the contactor opens, which automatically cuts in the resistance. These resistances prevent overloading the rectifier. Remember that the resistance is in when the contactor is open.
I would recommend to managers the purchase of one of the larger rectifiers. The modern tendency is to use high amperage and project a brilliant picture. The first cost will be greater, but it is worth the money. This, however, may be qualified by saying that in very small towns where the possible patronage is limited and every penny of expenditure has to be closely scrutinized it might not be advisable to go above the 30 ampere size.
Explanations. — We have told you in a general way of the action of the rectifier. Now let us examine into its "chronometer balance and cylinder escapement" and see if we can find out what it's all about.
Note: You need not be afraid to perform any of these various operations in case of necessity; just follow the directions and use a little common sense, remembering where each part goes,