Cyclopedia of architecture, carpentry, and building : a general reference work (1912)
American Technical Society · Chicago : American Technical Society · leaf 131
t ahroad hut it is not empKned e.xtensively in thrIniled States. It is eiislomary to operat*- siieh lamps at an eflieiencyof ahoiit l watt.s pir eandle-power. 103 10 ELECTRIC LIGHTING Lamps should always be renewed at the end of their useful life,this point being termed the smashing-point, as it is… … Fig. 7. Horizontal Distribution Curve for Single-Loop lil^ment. Fig. 6 shows the life curves of a series of incandescent lamps.These curves show that there is an increase in the candle-power ofsome of the lamps during the first 100 hours, followed by a periodduring which the value is fairly…
Architecture · Building
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