James Simpson was a British

United Kingdom

The United Kingdom of Great Britain and Northern IrelandIn the United Kingdom and Dependencies, other languages have been officially recognised as legitimate autochthonous languages under the European Charter for Regional or Minority Languages...

 civil engineer

Civil engineer

A civil engineer is a person who practices civil engineering; the application of planning, designing, constructing, maintaining, and operating infrastructures while protecting the public and environmental health, as well as improving existing infrastructures that have been neglected.Originally, a...

. He was president of the Institution of Civil Engineers

Institution of Civil Engineers

Founded on 2 January 1818, the Institution of Civil Engineers is an independent professional association, based in central London, representing civil engineering. Like its early membership, the majority of its current members are British engineers, but it also has members in more than 150...

 from January 1853 to January 1855.

James Simpson was the fourth son of Thomas Simpson, engineer of the Chelsea Waterworks

Chelsea Waterworks Company

The Chelsea Waterworks Company was a London waterworks company founded in 1723 which supplied water to many central London locations throughout the 18th and 19th centuries until its functions were taken over by the Metropolitan Water Board in 1902....

. James succeeded his father in both this post and that of engineer of the Lambeth Waterworks Company

Lambeth Waterworks Company

The Lambeth Waterworks Company was a utility company supplying water to parts of south London in England. The company was established in 1785 with works in north Lambeth and became part of the publicly-owned Metropolitan Water Board in 1903.-Origins:...

. It was under Simpson's instruction that the Chelsea Waterworks became the first in the country to install a slow sand filtration system to purify the water they were drawing from the River Thames

River Thames

The River Thames flows through southern England. It is the longest river entirely in England and the second longest in the United Kingdom. While it is best known because its lower reaches flow through central London, the river flows alongside several other towns and cities, including Oxford,...

. This filter consisted of successive beds of loose brick, gravel and sand to remove solids from the water.

He also designed waterworks at Windsor Castle

Windsor Castle

Windsor Castle is a medieval castle and royal residence in Windsor in the English county of Berkshire, notable for its long association with the British royal family and its architecture. The original castle was built after the Norman invasion by William the Conqueror. Since the time of Henry I it...

 and Bristol

Bristol

Bristol is a city, unitary authority area and ceremonial county in South West England, with an estimated population of 433,100 for the unitary authority in 2009, and a surrounding Larger Urban Zone with an estimated 1,070,000 residents in 2007...

 as well as The Wooden Pier

Southend Pier

Southend Pier is a major landmark in Southend-on-Sea. Extending into the Thames Estuary, it is the longest pleasure pier in the world. Sir John Betjeman once said that "the Pier is Southend, Southend is the Pier". The pier is a Grade II listed building....

 at Southend on Sea.