[Electric engineering.] . 18 ELECTRIC LIGHTING. G7 76. Direct-Current Constant-Potential Enclosed-Arc Lamps.—Fig. 38 shows a lamp that is similar in manyrespects to the constant-current lamp previously general features, such as the framework, clutch, methodof carrying current into the upper carbon, etc., are thesame in both. The mao;nets Jlf are in series and arranged. fig. 39. so as to pull up the plunger p. This plunger operates theclutch rod and its movements are dampened by means ofthe dashpot d. R is the resistance wound on an insulatingcylinder and connected in series to ta
[Electric engineering.] . 18 ELECTRIC LIGHTING. G7 76. Direct-Current Constant-Potential Enclosed-Arc Lamps.—Fig. 38 shows a lamp that is similar in manyrespects to the constant-current lamp previously general features, such as the framework, clutch, methodof carrying current into the upper carbon, etc., are thesame in both. The mao;nets Jlf are in series and arranged. fig. 39. so as to pull up the plunger p. This plunger operates theclutch rod and its movements are dampened by means ofthe dashpot d. R is the resistance wound on an insulatingcylinder and connected in series to take up the excessvoltage and steady the action of the lamp. Fig. 39 showsthe general arrangement of the mechanism and gives the 68 ELECTRIC LIGHTING. 18 connections, which are very simple. Notice that the(O) switch W cuts out the lamp by open- ing the circuit through it, not byshort-circuiting it, as in the case ofconstant-current lamps. Current en-ters at P and flows through the resist-ance and series coils to the upper car-bon, thence to the lower carbon to causes the core to be pulled upand the carbons to be separated. Asthey burn away, the current becomesweaker and p gradually lowers untilthe clutch is released and the lampfeeds. The resistance is provided withr^\ |lf \i a sliding contact, so that the lamp may be adjusted for pressures varying from100 to 120 volts.
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