Electric-wiring, diagrams and switchboards by Harrison Newton

Author:Harrison, Newton. [from old catalog]
Language: eng
Format: epub, pdf
Publisher: New York, The N. W. Henley publishing company
Published: 1906-03-25T05:00:00+00:00

i6o ELECTRIC-WIRING, DIAGRAMS

These figures are bound to vary after the lamps have been in use a certain number of days. After prolonged use the lamps appear smoky and give a poor and inefficient light, which is due to the increased resistance of the filament. But if more than the normal pressure is supplied the light though brilliant is in the end very expensive because of the subsequently rapid injury to the lamp and its exceedingly poor return for the power. The normal voltage of a lamp therefore changes; gradually rising as the life of a lamp goes on and thereby increases the watts per candle power and drops the efficiency lower. A lamp lasts much longer if the voltage is a little lower, and acts more satisfactorily as a light producer in the end as far as the expense for lamps is concerned. But the danger lies in the voltage being too low and the light too dim. Then the practical efficiency of the lighting plant is affected. If the drop in the wires cause this, the wiring is a failure, but if the dynamo pressure is too low it should be increased. As an

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