As early as 1917, the liquefaction method was proven. In the 1920s, Frank Phillips, founder of Phillips Petroleum, recognised the importance of natural gas as a source of valuable liquid by-products such as propane and butane.  Based on experiments begun in 1937, the first large scale cryogenic liquefaction project began in 1941 in Cleveland, Ohio. The first ship transport of LNG began in 1954 on an experimental basis with shipments from Louisiana to Canvey Island (UK) where the first LNG import terminal was established by British Gas. Large scale trade began in 1964 when British Gas began transporting LNG by ship from Algeria.