. Electrical world. Fl, 1 —M 1:KRTV struction of the relay. .\5 will be noted, the core of the relay isfree to oscillate within the coil spool, being supported upon itschisel-edged lower end. The contact circuit is carried through thebody of the core, the contact anvil being clamped between insulatingstrips upon the top of the mounting strip. To avoid cross-talkbetween adjacent coils, these are encased in copper shells. The chiefobjection, at once apparent, lies in the necessity of removing a wholestrip of relays in order to replace the parts of any one in case theserelays be mounted in
. Electrical world. Fl, 1 —M 1:KRTV struction of the relay. .\5 will be noted, the core of the relay isfree to oscillate within the coil spool, being supported upon itschisel-edged lower end. The contact circuit is carried through thebody of the core, the contact anvil being clamped between insulatingstrips upon the top of the mounting strip. To avoid cross-talkbetween adjacent coils, these are encased in copper shells. The chiefobjection, at once apparent, lies in the necessity of removing a wholestrip of relays in order to replace the parts of any one in case theserelays be mounted in groups according to the present custom. ELECTROMAGNETIC SIGN.^LS. It is quite frequently desirable in telephonj that a single signalgive two different indications under substantially the same circuitconditions. Under such circumstances it has been necessary toprovide auxiliary apparatus and circuits to control the signal :—M LARRIE ELECTROMAGNETIC SIGNAL. There have now appeared patents for several signals in which thesecondary controlling device is combined with the signal to form asingle piece of apparatus. In two cases the device includesa movable shield for signal target, the target being displayed onlywhen it and its movable shield bear the proper relation to a sta-tionary shield. The means employed for controlling the movableshield differ. Both signals described are for use as line signals. JrxE 25, 190^. ELECTRICAL WORLD and ENGINEER. 1199 Of these one is shown in ihc upper part of Fig. 2. As indicated bythe dotted lines, when neither coil is energized neither movablepart shows. When the rear coil, that connected in the line circuit,is energized, in response to the rising of the hook switch of thesubscriber, the target is displayed; and when the operator answersthe front coil, in series with one of the jack circuits, becomes ener-gized and elevates the movable shield to obsc
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectelectri, bookyear1883
