John Ellicott (1706-1772) One of the most eminent English clock and watchmakers, and the son of John Ellicott, a warden of the Clockmakers' Company. In 1738 he was elected a Fellow of the Royal Society, being recommended for that honor by Sir Hans Sloane, Bart., Martin Folkes, John Senex, the celebrated globe maker, and John Hadley, the astronomer. At the meetings of the Royal Society, he became acquainted with James Ferguson, who afterwards frequently visited Ellicott's house at St. John's Hackney, where an observatory was built, and various scientific experiments were made. Ellicott was the inven-tor of a compensation pendulum in which the bob rests on the longer ends of two levers, of which the shorter ends are depressed by the superior expansion of a brass bar attached to the pendulum rod. It tended to operate in jerks and was not widely used. Ellicott's production was distinguished by excellent workmanship. He paid great attention to the cylinder escapement and did much to bring it into use. He appears to have adopted it only two or three years after its invention by Graham in 1726. Ellicott was on the council of the Royal Society for three years, and read several papers, including one on the influence which two pendulum clocks were observed to have on each other.