. Lighthouse construction and illumination; . Fig. 127. Fig. 128-. arranged round the first, which forms a central nucleus;and in this way, depending on the state of the atmosphere,the power of the burner can be made at will 28, 48, 68,88, or 108 jets. Fig. 127 is an elevation of the burner, asarranged for 28 jets, with its oxidiser above. Fig. 128 isthe same for 108 jets, and Fig. 129 is an enlarged sectionof the 108-jet burner. In what he calls his biform, triform,or quadriform systems, referred to in Chap. X., Mr. Wighamplaces two, three, or four of the burners already describedvertically o
. Lighthouse construction and illumination; . Fig. 127. Fig. 128-. arranged round the first, which forms a central nucleus;and in this way, depending on the state of the atmosphere,the power of the burner can be made at will 28, 48, 68,88, or 108 jets. Fig. 127 is an elevation of the burner, asarranged for 28 jets, with its oxidiser above. Fig. 128 isthe same for 108 jets, and Fig. 129 is an enlarged sectionof the 108-jet burner. In what he calls his biform, triform,or quadriform systems, referred to in Chap. X., Mr. Wighamplaces two, three, or four of the burners already describedvertically one above the other, and by means of an iron casingor flue the products of the combustion of the lower burnersare intercepted and thrown outwards, so as not to interfere 212 LIGHTHOUSE ILLUMINATIOX. witli the upper burners, while pure air is supplied to each ofthem by cylindrical openings brought through the flues. 3 5 H 5 H5 Enn ^ ^ ^ S S. Fig. 129. Hie following table gives the candle powers, etc. Kos. of Jets. Consumption of CannelGas per hour. Candle power in SpenuCandles, consuming120 gre. per hour. 28 51-4 429-6 48 932 832-0 68 146-3 1250-18 88 244-0 2408-0 108 308-0 2923-0 The diameter of the 108-jet burner is 12 incites. SOURCES OF ILLUMINATION. 213 Among the many other sources of light which have beenproposed for lighthouse illumination may be mentionedDrummonds oxyliydrogen light; Gurneys proposal to supplypure oxygen to an oil flame; and Mr. Wighams method ofintroducing the electric spark, or oxyhydrogen light, into thecentre of his gas flame. CHAPTER IX. MISCELLANEOUS SUBJECTS CONNECTED WITHLIGHTHOUSES. Me. Alan Stevenson on the Distribution of Lights ON A Coast. The considerations, says Mr. Stevenson, in 1848, whiclienter into the choice of the position and character of the lightson a line of coast, are either, on the one hand, so simple andself-evident, as scarcely to admit of being stated in a generalform,
Size: 1483px × 1684px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1880, bookpublisherlondo, bookyear1881
