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On the sign:
THIS PLAQUE WAS UNVEILED ON 4th SEPTEMBER 1986 BY SIR GEORGE PORTER P. R.S. PRESIDENT OF THE BRITISH ASSOCIATION FOR THE ADVANCEMENT OF SCIENCE TO COMMEMORATE THE 150th ANNIVERSARY OF THE LAYING OF THE CLIFTON SUSPENSION BRIDGE FOUNDATION STONE BY HIS PREDECESSOR THE MARQUIS OF NORTHAMPTON ON 27th AUGUST 1836 AT 7.15 a.m.
Although the cornerstone was laid back in 1836, the bridge was opened only in 1864 More details about the bridge on the next sign Click for sign's details