The Clyde at Dumbarton Rock, with channel markers showing the position of the Lang Dyke, (lower right to middle left).
Constructed in 1773, the Lang Dyke aimed to constrain and speed up the flow of water, and so help deepen the channel by scouring.
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The Lang Dyke, along with other major engineeeirng projects, allowed ships to sail right into the heart of Glasgow.
Prior to this, ships could only get as far as Port Glasgow before having to be unloaded with their cargo finishing their journey by horse and cart.
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