Cyclopedia of architecture, carpentry, and building : a general reference work ... (1907)
American School of Correspondence · Chicago : American Technical Society · leaf 351
Lamps of 4 watts per candle-power should be installed whenthe regulation is poor. These values are for 110-volt lamps. A220-volt lamp should have a lower efficiency to give a lono- life. … Fig. 6. Lamps should always be renewed at the end of their usefullife, this point being termed the smashing-point, as it ischeaper to replace the lamp than to run it at the reduced candle-power. Some recommend running these lamps at a highervoltage, but that means at a reduced efficiency, and it is…
Architecture · Building · Carpentry
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