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Charles Labelye (1705, Vevey, Switzerland – 17 December 1781, ? Paris) was a Swiss bridge engineer and mathematician.
Moving to England in the 1720s and receiving patronage from the Duke of Bedford and Earl of Pembroke, he is best known there for his work on the original Westminster Bridge (rebuilt in 1854–62) and his invention on that project of caissons as a method of bridge-building. This was praised on its completion, though during the period of construction he received heavy criticism from ill-informed observers, which worsened his health.
Other British projects of his were Brentford Bridge (1740–42), London Bridge (his consultations were sought in 1746 but not acted upon by the corporation of London), designs for a harbour at Sandwich (engraved by Harris about 1740) and reports on the port and harbour facilities at Great Yarmouth (1747) and Sunderland (1748, also with suggested improvements to the River Wear).
An act of parliament in 1746 (19 Geo. II, cap. 26) naturalised him as a British citizen
April 1752 he decided to leave England for southern France.
He is known to have been in Naples in 1753, and to have later lived in Paris.
In Paris he met and became friends with the fellow bridge-builder Jean-Rodolph Perronnet, bequeathing him papers and a model of Westminster Bridge.