From actual survey showing the heights of the ponds on the lines of navigation from a level of 6 feet 10 inches under the Old Dock Sill at Liverpool from levels taken by Twyford & Wilson, Surveyors & Engineers, Manchester. Includes table of sizes of largest vessels which locks will admit. This image is a composite of 3 images taken of the map.
description
From actual survey showing the heights of the ponds on the lines of navigation from a level of 6 feet 10 inches under the Old Dock Sill at Liverpool from levels taken by Twyford & Wilson, Surveyors & Engineers, Manchester. Includes table of sizes of largest vessels which locks will admit. This image is a composite of 3 images taken of the map.
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