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It is by means of seamarks that the positions of these dangers are pointed out and the safe channels marked; they also serve the purposes of direction-posts [1].
Unknown[1]
The beginning of the following (the seventeenth) century saw several towers set upon salient points of our coasts for the purpose of showing lights therefrom to assist navigation [1].
Unknown[1]
The principal shoals and sandbanks around the British coasts are those formed at the mouths of the rivers Thames, Mersey, Humber, Tees, and Severn [1].
Unknown[1]
The practice of the ancients in regard to setting up light-towers is wrapped in some obscurity [1].
Unknown[1]
The term 'lighthouse' in itself obviously supplies a general explanation of what it signifies, but the purpose of a lighthouse is not fully revealed in its name [1].
Unknown[1]
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