 Joule died at home in Sale and is buried in Brooklands cemetery there.His gravestone is inscribed with the number "772.55", his climacteric 1878 measurement of the mechanical equivalent of heat, in which he found that this amount of foot-pounds of work must be expended at sea level to raise the temperature of one pound of water from 60 to 61 °F.This is also a quotacion from the Gospel of John