[Electric engineering.] . e bulb is verysmall this blackening is aggravated, because the surface issmaller and the deposit, for that reason, more dense. 14. Exhaustion.—Fig. 5 shows a lamp after the stemcarrying the filament and the leading-in wires have been sealed into the bottom. The lamp isnow ready to be exhausted. In orderto accomplish this, a small glass tubewith a narrow neck at a is sealed intothe top of the bulb. This tube is con-nected to an air pump, and while theair is being exhausted a current is sentthrough the filament. , This current isgradually increased as the exhaustionprog
[Electric engineering.] . e bulb is verysmall this blackening is aggravated, because the surface issmaller and the deposit, for that reason, more dense. 14. Exhaustion.—Fig. 5 shows a lamp after the stemcarrying the filament and the leading-in wires have been sealed into the bottom. The lamp isnow ready to be exhausted. In orderto accomplish this, a small glass tubewith a narrow neck at a is sealed intothe top of the bulb. This tube is con-nected to an air pump, and while theair is being exhausted a current is sentthrough the filament. , This current isgradually increased as the exhaustionprogresses, and, by heating the fila-ment, drives out any air that may havebeen absorbed by the carbon. Theoperator can tell by the performance ofthe lamp when the proper degree ofexhaustion has been reached, and sealsup the bulb by melting the glass tubeat the neck a. Numerous methods have been devised for the exhaustion of lamps. Ordinary mechanical air pumps, i. e., pumps that FlG 5. exhaust the air by the operation of a. §16 ELECTRIC LIGHTING. 9
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