
The FlatHolme Light was superseded because it was the last coal fire in England, and this type of beacon was generally unsatisfactory[1]. Some of these grates consumed as many as 400 tons of coal per annum and were completely exposed, which was a drawback[1].
When a gale blew off the land, the light on the sea side was of great relative brilliancy, but when off the water, the side of the fire facing the sea would be quite black[1]. Also, it was precisely when the wind was making a lee shore below the beacon that the more brilliant light was required[1].
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