[Electric engineering.] . e use, thecurrent from the cells becomes feeble, it will be necessary toreplace the liquid, but itfrequently happens thatthe power may be restoredby the addition of a lit-tle water to make upfor evaporation. The zincwill in course of time beconsumed, and must bereplaced, and the sal am-moniac may also be re-newed at the same time,although it should lastlonger than a single zincrod of the usual size(f inch diameter).- Afterfive or six rods have beenused, the material insidethe porous cup will nolonger act effectively, andthis means practically anew carbon and cup, sinc
[Electric engineering.] . e use, thecurrent from the cells becomes feeble, it will be necessary toreplace the liquid, but itfrequently happens thatthe power may be restoredby the addition of a lit-tle water to make upfor evaporation. The zincwill in course of time beconsumed, and must bereplaced, and the sal am-moniac may also be re-newed at the same time,although it should lastlonger than a single zincrod of the usual size(f inch diameter).- Afterfive or six rods have beenused, the material insidethe porous cup will nolonger act effectively, andthis means practically anew carbon and cup, since they may be procured very the case of renewal of a large number of cups, they maybe returned to the manufacturer and recharged by him. 39. Carbon cylindei cells are a modified form of theLeclanche. Sal ammoniac is used as the exciting fluid, orelectrolyte, but the porous cup is omitted. In its place acarbon cylinder is used that presents a large surface, andhence makes the cell have a low internal Fig. 8. AXUSTUNCIATORS. 40. When a number of push buttons are installed, it isnecessary to have an indicating arrangement to show fromwhich button the bell is rung. The instrument used is 30 INTERIOR WIRING. 28 called an annunciator. One ordinary house style is shownin Fig. 9. On the face are rows of small windows, before one of which an indica-tor appears when thebell rings, showing fromwhich room the signalhas been sent. A han-dle h at the side isintended to be used torestore the indicators totheir normal positionwhen the call is view of the indicatoritself is given in Fig. hinged arm a carries acard bearing the nameor number of the roomto which the drop is .con-nected, and is held up inthe position shown by acounterbalanced trip / infront of an electromag-net m. As soon as the current passes through the electro-magnet, the trip is attracted and the indicator falls, beingthen visible from the outsidethrough one ofin the front.
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Keywords: ., bookcentury1900, bookdecade1900, bookidelectricengi, bookyear1902
