 The Burt-McCollum sleeve valve, having its name from the surnames of the two engineers that patented the same concept with weeks of difference, Peter Burt and James Harry Keighly McCollum, patent applications are of August 6 and June 22, 1909, respectively, both engineers hired by the Scottish car maker Argyll, consisted of a single sleeve, which was given a combination of up-and-down and partial rotary motion.It was developed in about 1909 and was first used in the 1911 Argyll car.The initial 1900 investment in Argyll was £15,000 and building the magnificent Scotland plant cost £500,000 in 1920.