Port economics

Bibliographic data

Monograph

Identifikator:: 173564191X

URN:: urn:nbn:de:zbw-retromon-111718

Document type:: Monograph

Author:: Cunningham, Brysson http://d-nb.info/gnd/1055472266

Title:: Port economics

Place of publication:: London [usw.]

Publisher:: Pitman

Year of publication:: 1926

Scope:: IX, 134 S

Digitisation:: 2020

Collection:: Economics Books

Usage license:: Get license information via the feedback formular.

Chapter

Document type:: Monograph

Structure type:: Chapter

Title:: Chapter II. Explanation of terms used in connection with ports and harbours

Collection:: Economics Books

EXPLANATION OF TERMS USED } at all, in that they are not closed by gates or in any way cut off from the river Clyde. The author considers that it would be a great advantage if the use of the word Dock could be confined to docks properly so-called, namely, those which are completely encloseable by gates or other- wise, and not continuously in free and open communication with an outer waterway. There is scope for both terms and a rational field for each. Dealing with the subdivisions of the word Dock, a Wet Dock is a dock in which water is retained for the purpose of receiving and berthing vessels alongside its walls or quays, and so keeping them continuously afloat at all stages of the tide. This means that at ports round the British Isles, where the rise and fall of the tidal level is generally considerable, ranging up to as much as 50 ft. between high and low water, gates have to be provided to impound the water between successive periods of high water. Where the tidal range is small or moderate, say not exceeding 12 to 15 ft., gates are not found to be absolutely essential, and an open basin may serve the same purpose as a dock, provided it be dredged deep enough to afford the necessary draught at extreme low water. This impounding of the water to maintain the level naturally involves the separation of the dock from the outer waterway for long periods—that is at all times except when the two levels, the outer and the inner, approximately coincide; in other words, at and about high water. Such isolation, however, could hardly be submitted to in any important commercial port, and -the difficulty is overcome by a system known as Locking. A Lock is a small antechamber to a dock with dimensions sufficient to accommodate the largest single ship likely to make use of it. It has essentially two pairs of gates, one at each end, communicating respectively at the outer end with the waterway and at the inner end with the dock. One pair of gates being closed for impounding purposes and so maintained, a vessel is able to enter from IC

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