During his residence in Birmingham, Messrs Chance being makers of glass for use in lighthouse lamps, his attention was naturally turned to problems of lighthouse illumination, and he was able to devise improvements in both the catoptric and dioptric methods for concentrating and directing the beam. [Please select]
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------------------------------------------------------------------------ The floating lights of England are illuminated by means of lamps with metallic reflectors, on what is styled the catoptric system. [Please select]
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