The challenge of devising a clock which recorded solar as well as Greenwich mean time occupied the great makers of the golden age of English clockmaking, men like Thomas Tompion and Daniel Quare. Their less famous contemporary, Joseph Williamson, designed a number of equation clocks and also constructed several movements which Quare used. The probem was to compare mechanically solar time derived from a sundial, with mean time. Tompion worked out an equation table, which he had printed, to show the number of minutes and seconds solar time was fast or slow of mean time on any day of the year. An equation clock constructed by Daniel Quare had an auxiliary dial in the front of the case, below and separate from the main dial. It had two hands, a long one revolving once in 365 days and a shorter one with a sun to show the difference in minutes, fast or slow, between solar and mean time. Another of Quare's equation clocks had a double movement with two pendulums and, although it was not capable of recording accurately the equation of time, it was a reasonably acceptable solution.