CHAPTER XII.

THE LIGHTHOUSE (_concluded_). Lighthouses on Sand—Literally screwed down—The Light on Maplin 182 Sands—That of Port Fleetwood—Iron Lighthouses—The Lanterns themselves—Eddystone long illuminated with Tallow Candles—Coal Fires—Revolution caused by the invention of the Argand Burner—Improvements in Reflectors—The Electric Light at Sea—Flashing and Revolving Lights—Coloured Lights—Their Advantages and Disadvantages—Lanterns obscured by Moths, Bees, and Birds