. Lighthouse construction and illumination; . Fig. 54. Fig. 55. apparatus is made more compact; and Figs. 5 6 and 5 7show a method of utilising the backx part of the light, so as to avoid the loss of light due to reflected rays fallingon the burner. The prisms (j?) will bedescribed in No.

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Keywords: ., bookcentury1800, bookdecade1880, bookpublisherlondo, bookyear1881