William Jessop | |
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| Born | 23 January 1745 Devonport, Plymouth, England |
| Died | 8 November 1814(1814-11-08) (aged 69) Butterley Hall,Ripley, Derbyshire, England |
| Occupation | Civil Engineer |
| Known for | His Work onCanals,Cromford Canal,West India DocksOxford Canal,Grand Canal (Ireland),Dublin |
William Jessop (23 January 1745 – 18 November 1814) was an Englishcivil engineer, best known for his work oncanals,harbours and early railways in the late 18th and early 19th centuries.
Jessop was born inDevonport, Devon, the son of Josias Jessop, a foreman shipwright in the Naval Dockyard. Josias Jessop was responsible for the repair and maintenance of Rudyerd's Tower, a wooden lighthouse on theEddystone Rock. He carried out this task for twenty years until 1755, when thelighthouse burnt down.John Smeaton, a leadingcivil engineer, drew up plans for a new stone lighthouse and Josias became responsible for the overseeing the building work. The two men became close friends, and when Josias died in 1761, two years after the completion of the lighthouse, William Jessop was taken on as a pupil by Smeaton (who also acted as Jessop's guardian), working on various canal schemes inYorkshire.[1]
Jessop worked as Smeaton's assistant for a number of years before beginning to work as an engineer in his own right. He assisted Smeaton with the Calder and Hebble and the Aire and Calder navigations in Yorkshire.[1]
The first major work that Jessop is known to have carried out was theGrand Canal of Ireland. This had begun as a Government project in 1753, and it had taken seventeen years to build fourteen miles (23 km) of canal from theDublin end. In 1772 a private company was formed to complete the canal, and consulted John Smeaton. Smeaton sent Jessop to take control of the project as principal engineer. Jessop re-surveyed the proposed line of the canal and carried the canal over theRiver Liffey, via the Leinster Aqueduct. He also drove the canal across the greatBog of Allen, a feat comparable withGeorge Stephenson's crossing of theChat Moss bog with theLiverpool and Manchester Railway. The canal was carried over the bog on a high embankment. Jessop also identified sources of water and builtreservoirs, so that the canal was in no danger of running dry. Having seen to all of the important details Jessop returned to England, leaving a deputy in charge to complete the canal. This was finally done in 1805. It seems that Jessop was closely involved with the canal in Ireland until about 1787, after which time, other work flowed in.[1]
Jessop was a very modest man, who did not seekself-aggrandizement. Unlike other engineers, he was not jealous of rising young engineers, but rather encouraged them. He would also recommend another engineer if he was too busy to be able to undertake a commission himself. He recommendedJohn Rennie for the post of engineer to theLancaster Canal Company, an appointment that helped to establish Rennie's reputation. When Jessop was consulting engineer to theEllesmere Canal Company, in 1793, the company appointed the relatively unknownThomas Telford as resident engineer. Telford had no previous experience as a designer of canals, but with Jessop's advice and guidance, Telford made a success of the project. He supported Telford, even when the Company thought that the latter's designs for aqueducts were too ambitious.[1]
In 1789 Jessop was appointed chief engineer to theCromford Canal Company. The proposed canal was intended to carry limestone, coal and iron ore from the Derwent and upper Erewash valleys and join the nearby Erewash Canal. The important features of this canal are the Derwent Viaduct, which was a single span viaduct carrying the canal over theRiver Derwent, and theButterley Tunnel (formerly the Ripley Tunnel). In 1793, the Derwent Viaduct partially collapsed, and Jessop shouldered the blame, saying that he had not made the front walls strong enough. He had the viaduct repaired and strengthened at his own expense. The Butterley Tunnel was 2,966 yards (2,712 m) long, 9 ft (2.7 m) wide and 8 ft (2.4 m) high and required thirty-three shafts to be sunk from the surface to build it. Jessop built the Butterley Reservoir above the tunnel, extending for 50 acres (20 ha).[1]
In 1790 Jessop founded, jointly with partnersBenjamin Outram, Francis Beresford and John Wright, theButterley Iron Works in Derbyshire to manufacture (amongst other things) cast-ironedge rails – a design Jessop had used successfully on ahorse-drawn railway scheme for coal wagons betweenNanpantan andLoughborough, Leicestershire (1789). Outram was concerned with the production of ironwork and equipment for Jessop's engineering projects.[2]
TheOxford Canal had been built byJames Brindley and carried coal to large parts of southern England. However, it did not provide a sufficiently direct route between theMidlands and London. As a result, a new canal was proposed to run from the Oxford Canal atBraunston, nearRugby, and to end at theThames atBrentford, a length of ninety miles. Jessop was appointed Chief Engineer to the Canal Company in 1793. The canal was especially difficult to plan because, whereas other canals tended to follow river valleys and only crossed a watershed when unavoidable, the new canal had to cross the rivers Ouse, Nene and others. An aqueduct was built atWolverton to carry the canal across the Ouse valley. Whilst the three-arch stone aqueduct was being built, a set of nine temporary locks were used to carry the canal down one side of the valley and up the other. Theaqueduct failed in 1808, and was replaced by an iron one in 1811, the iron trough design sharing a similar structure toLongdon-on-Tern Aqueduct and thePontcysyllte Aqueduct built byThomas Telford. It is known as theCosgrove aqueduct and was designed and built byBenjamin Bevan.
Two tunnels also had to be built, atBraunston andBlisworth. The Blisworth Tunnel caused great problems, and was unfinished when the rest of the canal was ready. In fact Jessop considered abandoning it and using locks to carry the canal over the ridge. Jessop's temporary solution was a railway line laid over the ridge to carry traffic until the tunnel was completed. TheGrand Junction Canal was enormously important in encouraging trade between London and the Midlands.[1]
TheWest India Docks, built on theIsle of Dogs, was the first largewet docks built in thePort of London. Between 1800 and 1802 a wet dock area of 295 acres (1.19 km2) was created with a depth of 24 ft (7.3 m), and accommodating 600 ships. Jessop was the Chief Engineer for the docks, withRalph Walker as his assistant.[1]
In 1799 separate proposals were put forward for a canal from London toPortsmouth and for a tramway carrying horse-drawn carriages over the same route. The first part of the proposedSurrey Iron Railway was to be fromWandsworth toCroydon, and Jessop was asked for his opinion on the two opposing schemes. He declared that the tramway was a better scheme, as a canal would require too much water and would unduly reduce the supply in theRiver Wandle. It was agreed to build a tramway from Wandsworth to Croydon, as well a building a basin at Wandsworth. Jessop was appointed Chief Engineer of the project in 1801. In 1802 the Wandsworth Basin and the line were completed. There seems to be doubt as to the gauge of the line with some estimates stating 4 ft 2 in (1.27 m) and others stating 4 ft 8½ in.[1]
In 1803, the next phase was authorized for a line from Croydon viaMerstham toGodstone in Surrey. Jessop was again appointed Chief Engineer, with his sonJosias as his assistant. The line reached Merstham but was never continued to Godstone. The total distance of the tramway from Wandsworth was 18 miles (29 km). The tramway was eventually overtaken by the advent of steam locomotives.[1]
From 1784 to 1805 Jessop lived inNewark in Nottinghamshire, where he twice served as town mayor.[2]
In his later life, Jessop became increasingly inflicted by a form of paralysis, and 1805 marked the end of his active career. He died at his home,Butterley Hall, on 18 November 1814. His sonJosias became a successful engineer in his own right.[1]
Jessop was in the unusual position of bridging the gap between thecanal engineers and therailway engineers who came later. His name did not gain the lasting fame that it deserved because of his modesty. Indeed, some of his works have been wrongly attributed to engineers who acted as his assistants. Unlike some engineers, such asGeorge Stephenson, Jessop did not stoop to undignified wrangles with fellow professionals. He was highly regarded by almost all those who had worked with him or for him.[1]
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