The Knott family of lighthouse keepers is credited with the longest period of continuous service in the history of staffed lighthouses, commencing in 1730 at South Foreland, Kent, with William Knott and ending in 1906 at Skerries (Anglesey, Wales) with Henry Thomas Knott (son of George Knott – see below) who died in 1910 having retired to Crewe. There are three famous lighthouse-keeping families in England, the other two being the Darling (see: Grace Darling) and the Hall families. The three families are inter-related. South Foreland Much of the contribution of the Knott family to lighthouse keeping was made at South Foreland Lighthouse where members oversaw many changes in lighting technology from coal fires to electricity. Two fixed white lights were exhibited as a 'high' and a 'low' light from the South Foreland from 1634. These were simple coal fires until 1793, during the time of William's service from 1730 and Henry's from 1777. In 1793, 53 cm (21-inch) diameter parabolic reflectors were used to concentrate and direct the light from burning sperm oil. In 1842/3 the towers of both lighthouses were partly rebuilt and the keepers and their families at both lighthouses benefitted from entirely new accommodation. Henry Thomas and his sons, George and John, were present in the late 1850s when Michael Faraday and Professor Holmes carried out the first experiments with electricity as a light source. Much work on the electrification of the lights continued from 1869. Henry Knott During Henry Knott's period of service, in 1813, the great Scottish lighthouse engineer, Robert Stevenson paid a visit to the Forelands as part of one of his famous inspection tours. He wrote, "Find the South and North Foreland lights to be fitted up in the modern style with from 12 to 14 plated reflectors in each lightroom which were not thoroughly cleaned and some reflectors were in rather a dirty state. The lightkeepers are comfortably lodged and seem to be well pleased with their situations. The dwelling houses partake of that cleanliness which is general in the cottages of the English." George Knott George Knott was the fourth in the succession. After serving under his father at the South Foreland low lighthouse, he was transferred in 1861 to the Smeaton tower on the Eddystone where he remained for five years as Principal Keeper. From there he moved to the little-known Bideford lighthouse where he remained until 1879 when