Light and lighting . complete. It isalso the date at which the competitionof electricity began to make itself felt. Public Lighting in the South Metropolitan Gas District, 1882 to 1913. Date. No. of Burners. Total candle-power(estimated). 1882 1913 14,014 (flat-flame)24,560 (incandescent) 175,1751,410,230 A calculation shows that, in spite of thecandle-power being increased about eighttimes, the cost to-day would presumablynot exceed that in 1882. The date 1882has been selected as giving an idea ofthe enormous change that has come overpublic lighting in the last thirty doubt in m
Light and lighting . complete. It isalso the date at which the competitionof electricity began to make itself felt. Public Lighting in the South Metropolitan Gas District, 1882 to 1913. Date. No. of Burners. Total candle-power(estimated). 1882 1913 14,014 (flat-flame)24,560 (incandescent) 175,1751,410,230 A calculation shows that, in spite of thecandle-power being increased about eighttimes, the cost to-day would presumablynot exceed that in 1882. The date 1882has been selected as giving an idea ofthe enormous change that has come overpublic lighting in the last thirty doubt in many streets the increase isfar greater, and of course there are also It will be observed also that in the SouthMetropolitan Gas district the lightingis carried out mainly by low-pressure(2—3). But if we were to take sucha street as Whitehall, using high-prassuregas lamps and lamps giving severalthousand candle-power, the differencewould be still greater. We might sum-marise the condition of public lighting by. Fig. 1.—Parade das Lighting : Lewisham Road. 120 THE ILLUMINATING ENGINEER (march) gas from the oil-lamps period up to thepresent day somewhat as follows :— progress in illuminants has been verygreat. The introduction of high-pressure Nature of Illuminant. Period. Public lamps. • onsumedcub. ft. p r hr. C P CR per cub. ft. Oil lamps .. u ly gas burnersIron-tip em burners e burnersBpe -me ..I ..I Boenl inverted low preesureIncandescent inverted high up to 1800about 1810 I860 1878 1*78—1895 I-:..1908— IM!1914 3(?)5—8 5—6 in U ?1\—84li -70 i-l(?)3 12 1530—40 50- 2000—1,000 KT) :i6 11 50—60 An jmportanl point to notice in thistable i. the rate of progbecome increasingly rapid during the lastfew jears. Previous to 1882 few radicalimprovements were made in street light-ing, which remained substantially thesame many years. Bui since 1900 the gas has added immensely to
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