CHAPTER III.

LIGHTHOUSE ILLUMINATION.

Early modes of illumination--Facet reflectors and lamps--Silvered copper reflectors and Argand lamps--Isle of May coal light-- Improvements in catoptric lights--Distinctions for lighthouses invented by Mr. Stevenson, viz., flashing, intermittent, and double lights--Floating light lantern--Lighting of stage of Covent Garden Theatre--Dioptric system of lighthouse illumination 48