. Electrical news and engineering . nt in this closed coilwhich drags the iron disc around. No brushes or commutatorare required ; the disc has no electrical connection retarding motion is effected by an aluminum fan fixed on thesame spindle as the disc. It is an ampere hour recording meterand consequently the speed is directly proportional to the calibration depends on the angle of the closed coil to that ofthe main coil. The Duncan meter, of the Fort Wayne Co., has also made agood record, .md like the above has neither commutator norbrushes. The .armature is an alumi
. Electrical news and engineering . nt in this closed coilwhich drags the iron disc around. No brushes or commutatorare required ; the disc has no electrical connection retarding motion is effected by an aluminum fan fixed on thesame spindle as the disc. It is an ampere hour recording meterand consequently the speed is directly proportional to the calibration depends on the angle of the closed coil to that ofthe main coil. The Duncan meter, of the Fort Wayne Co., has also made agood record, .md like the above has neither commutator norbrushes. The .armature is an aluminum cylinder and the closedsecorular\- is made oi several copper punchings. Tliis meter ^^zsaznzni =™^ any of you wish to follow them up,no doubt. end of a cylinder (in a magnet field)rotate, and this is the principle of the. !2. Current is admitted to thebottom edge of the inverted copper; and leaves by the nickel rod at the;i minimum. The speed of rotationwill register very small currents inay 60 amperes ; it will start up with. Perry M eter Fig 12. depends on the repulsion of a closed secondary from its primary coils are in a series with the lamp circuit. The re-tarding effect is obtained in the same manner as the Shallenberger. Probably the most important of all these motor meters is theThomson recording wati meter. One of the advantages claimed for this meter is that it is adaptedfor continuous and ilternating currents. This may be an ad-vantage and it may not. In so far as we have meters for alter-nating currents of a simpler design, it looks to me as if it would bebetter and cheaper to have the separate meters. This is more amatter of opinion, however. In Fig. 14 is shown diagranimaticallythe Thomson watt meter. In the armature circuit is placed a highresistance coil, generally placed in the bottom or back of the meterand part in the field, the object of this latter part being to producea field of sufficient strength to overcome the friction of the movingp
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