. Practical electricity for beginners. it may be burnt out; that is, the fila-ment may be burnt or broken. To determine whether or notthis is the case, try a different lamp in the same socket orhold it up to the light and examine the filament. Sometimes,if there is only a single break in the filament, it is possible toweld the ends together by giving the lamp a gentle tap whilethe current is on. 79. An Open or Disconnected Switch.—Sometimesthere is more than one switch in a lamp circuit, as in the casewhere several lamps are suspended from one fixture to makepossible the operating of any or al
. Practical electricity for beginners. it may be burnt out; that is, the fila-ment may be burnt or broken. To determine whether or notthis is the case, try a different lamp in the same socket orhold it up to the light and examine the filament. Sometimes,if there is only a single break in the filament, it is possible toweld the ends together by giving the lamp a gentle tap whilethe current is on. 79. An Open or Disconnected Switch.—Sometimesthere is more than one switch in a lamp circuit, as in the casewhere several lamps are suspended from one fixture to makepossible the operating of any or all of them (Fig. 49). Oneshould be certain that both the wall switch and the keyswitch in the socket are closed. A push-button switch isclosed when the white button is pushed in, and a key switch THE OPERATION OF ELECTRICAL LAMPS 75 usually snaps as it is turned off; that is, it gives a sort of aclick when it is turned off and makes no sound as it is turnedon. The key usually turns a little harder when turned onthan when turned U Fig. 49. A common installation. The wall switch controls bothlamps, and the key switches control them individually. A diagram ofthe connections is given also. If the wall switch is disconnected, or if the connectionsto it are loose, it is possible that closing a door or jarring theswitch in any way may cause the lamps on Its circuit to goout or to flicker. In such a case, remove the switch cover andfasten the wires firmly under the screws in the switch termi-nals. These wires are in plain view, and this adjustment canbe made very easily without danger. If the wall switch is found to be all right, and the keyswitch tmned on, and still the lamp refuses to light whenplaced in the socket, and if there is only a single socket, thefault may be that listed in No. 6, Sec. 76. If, however, thefixture into which the lamp in question has been placed is formore than one lamp, try the other sockets in the same fix-ture. If the lamp lights in any of them, the
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectelectri, bookyear1921
