SZ0387 : Ferry Chain

taken 8 years ago, near to Sandbanks, Poole, Great Britain

Ferry Chain
Ferry Chain
This is part of one of the two chains that guide the Sandbanks ferry on its short journey across the mouth of Poole Harbour.

The ferry propulsion is achieved by driven cog wheels on the ferry pulling the ferry across on the chains. There are two parallel chains both rigidly fixed on the Sandbanks side. The wheels only drive on one chain, the chain which is opposite the direction in which the tide is flowing as this results in less wear on the chain. The water is deeper close to Sandbanks and the higher tide flows result in greater wear of the chain at that end. On the other side of the channel the chains lie along the road, and are connected to counter weights in large pits. These weights keep a continual tension in the chains.
As the chain at the Sandbanks end wears out, sections are removed and additional sections added to the other end using shackles. The chains are made of hardened steel and are manufactured 50m longer than the channel span which allows for the worn sections to be moved several times before a full replacement is required. New chains 350m long cost almost 20,000 and are required every 18 months.
Wear between links in the chain and some stretching results in the chains themselves getting longer and for this reason two links are removed every fortnight.
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SZ0387, 423 images   (more nearby )
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Date Taken
Thursday, 1 July, 2010   (more nearby)
Sunday, 4 July, 2010
Ferry chain   (more nearby)
Subject Location
OSGB36: geotagged! SZ 037 870 [100m precision]
WGS84: 50:41.0073N 1:56.9140W
Camera Location
OSGB36: geotagged! SZ 037 870
View Direction
NORTH (about 0 degrees)
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