The two cranes, one in central Glasgow and the other at Greenock (pictured above), have become landmarks that symbolise the past industrial greatness of the Clyde.
In all, 27 giant hammerhead cranes were built in Britain but only 15 survive and seven of these are at risk of being lost. The James Watt Dock crane at Greenock, which was built in the 1880s, can lift up to 150 tons.
Photograph: Craig Easton
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