Question: What year was the historian and author who maintained the Helmshore Mills Textile Museum knighted?

full_context: Document 1: Salmon Falls Mill Historic District: The Salmon Falls Mill Historic District encompasses a historic mill complex on Front Street in Rollinsford, New Hampshire. The complex includes four major structures and seven smaller ones, on about 14 acre of land along the Salmon Falls River. They were built between about 1840 and the mid-1860s, and have an unusual architectural unity, for additions made to the buildings were done with attention to matching elements of the existing structures. The Number 2 Mill, built in 1848, was an early location where a turbine was used instead of a waterwheel to provide power to the mill machinery. The district was listed on the National Register of Historic Places in 1980.
Document 2: Boyle baronets: The Boyle Baronetcy, of Ockham in Salehurst in the County of Sussex, is a title in the Baronetage of the United Kingdom. It was created on 14 December 1904 for Edward Boyle a barrister, businessman and Conservative Member of Parliament for Taunton. His grandson, the third Baronet, was also a Conservative Member of Parliament and ultimately cabinet minister serving as Minister of Education from 1962 to 1964. He was made a life peer as Baron Boyle of Handsworth, of Salehurst in the County of Sussex, in 1970 and became Vice-Chancellor of the University of Leeds in the same year. The life peerage became extinct on his death in 1981 and he was succeeded in the baronetcy by his younger brother, the fourth Baronet. As of 2010 the title is held by the latter's eldest son, the fifth Baronet, who succeeded in 1983.
Document 3: Anthony Eden: Robert Anthony Eden, 1st Earl of Avon, (12 June 1897 – 14 January 1977) was a British Conservative politician who served three periods as Foreign Secretary and then a relatively brief term as Prime Minister of the United Kingdom from 1955 to 1957.
Document 4: Helmshore Mills Textile Museum: Helmshore Mills are two mills built on the River Ogden in Helmshore, Lancashire. Higher Mill was built in 1796 for William Turner, and Whitaker's Mill was built in the 1820s by the Turner family. In their early life they alternated between working wool and cotton. By 1920 they were working shoddy as condensor mule mills; and equipment has been preserved and is still used. The mills closed in 1967 and they were taken over by the Higher Mills Trust, whose trustees included Chris Aspin, the historian and author and Dr Rhodes Boyson who maintained it as a museum. The mills are certainly the most original and best preserved examples of both Cotton Spinning and Woollen Fulling left in the country which are still operational.
Document 5: Rhodes Boyson: Sir Rhodes Boyson (11 May 192528 August 2012) was a British educator, author and politician; Conservative Member of Parliament for Brent North. He was knighted and made a member of the Privy Council in 1987.
Document 6: Haines Mill: Haines Mill, also known as Haines Mill Museum, is a historic grist mill located at South Whitehall Township, Lehigh County, Pennsylvania. It was built about 1840, and is a four-story, stone building with a slate covered gambrel roof. It is three bay by three bay, 42 feet by 46 feet, 9 inches. The interior was rebuilt after a disastrous fire in 1908. A three-story brick addition was built in 1930, with a lean-to roof. Atop the main roof is a cupola. It remained in full operation until 1957. Today, Haines Mill is operated as a partnership between the County of Lehigh, which owns and maintains the site, and the Lehigh County Historical Society, which provides public tours.
Document 7: E. C. Rhodes: Edmund Cecil Rhodes (1892–1964), a statistician, was born in Yorkshire and named after Cecil Rhodes. He went to Bradford Grammar School and Trinity College, Cambridge where he graduated as Wrangler (B-star) in 1914. In 1924 he became Reader at the London School of Economics where he remained until he retired in 1958. He wrote for Biometrika and the Journal of the Royal Statistical Society, and Edgeworth called him a "pathbreaker" (see obituary by Grebenik).
Document 8: Cecil Rhodes: Cecil John Rhodes PC (5 July 1853 – 26 March 1902) was a British businessman, mining magnate and politician in South Africa, who served as Prime Minister of the Cape Colony from 1890 to 1896. An ardent believer in British imperialism, Rhodes and his British South Africa Company founded the southern African territory of Rhodesia (now Zimbabwe and Zambia), which the company named after him in 1895. South Africa's Rhodes University is also named after him. Rhodes set up the provisions of the Rhodes Scholarship, which is funded by his estate, and put much effort towards his vision of a Cape to Cairo Railway through British territory.
Document 9: Enoch Powell: John Enoch Powell, MBE (16 June 1912 – 8 February 1998 ) was a British politician, classical scholar, philologist, and poet. He served as a Conservative Member of Parliament (MP, 1950–74), Ulster Unionist Party (UUP) MP (1974–87), and Minister of Health (1960–63).
Document 10: Anthony Crosland: Charles Anthony Raven Crosland (29 August 1918 – 19 February 1977), otherwise Tony Crosland or C.A.R. Crosland, was a British Labour Party politician and author. He served as Member of Parliament for South Gloucestershire and later for Great Grimsby. Throughout his long career he occupied the cabinet positions of Secretary of State for Education and Science, President of the Board of Trade, Secretary of State for Local Government and Regional Planning and Foreign Secretary. A prominent socialist intellectual, he became one of the Labour Party's revisionists on the right, as an intellectual leader of Gaitskellism. His highly influential book "The Future of Socialism" (1956) argued against many Marxist notions and Labour Party orthodoxy that public ownership was essential to make socialism work. He offered positive alternatives to both right and left wings of his Labour Party. He questioned the need for public ownership of the means of production – the classic socialist formulation – and argued instead for making the highest priority the end of poverty and improved public services. He led the Labour battle to replace grammar schools with comprehensive schools that did not sort students at age 11. As foreign secretary he promoted détente with the Soviet Union.
Document 11: Lewis Textile Museum: The Lewis Textile Museum was bequeathed to the people of Blackburn by a local cotton industrialist, Thomas Boys Lewis (1869–1942). The Lewis Textile Museum was closed in 2006 and a new gallery with its collection of looms and textile machinery was moved to Blackburn Museum and Art Gallery. The gallery which now houses the exhibits at the main Museum & Art Gallery was named "CottonTown" and opened in April 2007 by Jack Straw, the local Labour MP.
Document 12: Viscount Brentford: Viscount Brentford, of Newick in the County of Sussex, is a title in the Peerage of the United Kingdom. It was created in 1929 for the Conservative politician Sir William Joynson-Hicks, 1st Baronet, chiefly remembered for his tenure as Home Secretary from 1924 to 1929. He had already been created a baronet, of Holmsbury, in the Baronetage of the United Kingdom, on 20 September 1919. His younger son, the third Viscount, was also a Conservative politician. On 29 January 1956, two years before he succeeded his elder brother in the viscountcy, he was created a baronet, of Newick. s of 2017 the titles are held by the third Viscount's son, the fourth Viscount, who succeeded in 1983, a retired solicitor and has served as the president of the Church Society.
Document 13: Amos Chase House and Mill: The Amos Chase House and Mill are a historic property on New Hampshire Route 114, just south of the Piscataquog River in Weare, New Hampshire. The house is a 2-1/2 Greek Revival two-family house built c. 1836. It has two similar five-bay facades (southeast and northeast) with central entries framed by pilasters and topped by architraves. The adjacent mill building is also a wood-frame structure, built c. 1849. Both buildings have seen only modest and superficial alteration since their construction. The mill is the only surviving 19th-century mill building in Weare, out of a cottage industry that once saw a dozen or more such buildings. This mill was the only one in the town to survive the New England Hurricane of 1938, although its waterwheel was washed away. The mill race providing water to the mill from the Piscataquog is still visible on the property, as is a dam built by Chase. Chase was a tool manufacturer; his son later used the mill in the manufacture of baskets.
Document 14: Faber Mill: The Faber Mill (French: "Moulin Faber" ) is a watermill in Hotton (in the "Rue Haute") built in 1729. The mill is a listed building and is built from limestone with a pegged roof and is nowadays a museum. There are four levels inside the building: one level for the three mills, one for the pairs of millstones, one for the bolting and an attic. The mill has two wheels outside in a tributary of the river Ourthe. One wheel is made of wood and the other is made of metal. The mill still works for the enjoyment of tourists and produces different qualities of flour.
Document 15: Foster Spinning Co.: Foster Spinning Co. is an historic textile mill on Cove Street in Fall River, Massachusetts. The mill was built in 1916 from red brick and had a capacity of 13,312 spindles when built. It was the last new textile mill built in Fall River. Its buildings are not particularly architecturally distinctive, representing typical early-20th century mill construction, but the complex is relatively complete, including the original main mill, boiler house, smokestack, and wooden storage building. In 1920 the plant was enlarged, increasing its capacity to 25,000 spindles. The Foster Spinning Company operated on the premises until 1962.
ground_truth: 1987