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What is a common lighthouse illuminating mistake?

 title: 'A ROMAN PHAROS. (From a Medal in the D'Estrtes' Collection.}'

It has been contended that the British coast is too plentifully supplied with beacon-marks, and that danger lurks in their very abundance[1].

This is very probable if the means had not been provided of easily distinguishing between them, but a distinction in the character of each light, is a safeguard against danger[1]. If by accident the navigator has been driven out of his reckoning, this distinction will enable them at once to calculate his true position[1].


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