It was not until alluvial gold was discovered at Arltunga, east of the present Alice Springs, in 1887 that any significant European settlement occurred. The town's first substantial building was the Stuart Town Gaol in Parson's Street; this was built in 1909, when the town had a European population of fewer than 20 people. Many of the gaol's first prisoners were first-contact aboriginal men incarcerated for killing cattle. The first aircraft, piloted by Francis Stewart Briggs landed in 1921. Central Australia's first hospital, Adelaide House, was built in 1926 when the European population of the town was about 40. It was not until 1929, when the train line to Alice was built, that the town's European population began to grow. Aboriginal Centralians outnumbered European Centralians until the mid-1930s. From 1926 to 1931, Alice Springs was the seat of government for the now-defunct Territory of Central Australia. Until 31 August 1933, the town was officially known as Stuart.