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MANAGERS AND PROJECTIONISTS 501
half of the ring is immersed in oil, oil will be continually carried up to the journal by the ring. Second, if the weather be cold and the oil be stiff, then the friction of the journal may not be sufficient to revolve the ring, hence the journal will receive no lubrication until it has heated up sufficiently to melt the oil. For this reason a too-heavy oil must not be used in winter if the machine is located in a cold room.
CAUTION. — Be sure your oil is free from dust or sediment. Never leave an oil receptacle standing open. If you do it will collect dust and its lubricating quality will be greatly impaired. Dirty oil very frequently is the cause of trouble in bearings, and in any event it wears bearings very fast.
GENERAL INSTRUCTION NO. 4— CLEANLINESS.— It is important that all parts of motor generators be kept scrupulously clean. Oil should not, under any circumstances, be allowed to collect either on the machine or on the floor near it, and the machine should be kept free from dust. A medium size hand bellows will be found very convenient for removing dust from the armature, from around the pole pieces and in other inaccessible places. A dirty machine is evidence of a lazy, indifferent or incompetent attendant.
GENERAL INSTRUCTION NO. 5— LOOSE CONNECTIONS.— It is highly important that all electrical connections and all bolts and nuts be inspected periodically and tightened up, and all electrical connections be kept not only tight, but perfectly clean. Loose connections are a continual source of unnecessary trouble.
GENERAL INSTRUCTION NO. G-AMMETER AND VOLTMETER. — Motor generators are, or should be, provided with both an ammeter and voltmeter, which instruments, in order to serve their best purpose, must be located within view of the projectionist when he is in working position beside the projector. These instruments should be constantly under the eye of the projectionist. It is a serious mistake to locate them where they cannot be read easily and continually observed, because there are certain points at which the arc furnishes maximum illumination with minimum current consumption, and if the ammeter and voltmeter be located within plain view of the projectionist, preferably on the front wall of the projection room, near the left hand projector observation port, the projectionist is very much more likely to handle his arc efficiently. This is especially true if the arc be hand fed.