Imperial acquired Silwood Park in 1947, to provide a site for research and teaching in those aspects of biology not well suited for the main London campus. Felix, Imperial's student newspaper, was launched on 9 December 1949. On 29 January 1950, the government announced that it was intended that Imperial should expand to meet the scientific and technological challenges of the 20th century and a major expansion of the College followed over the next decade. In 1959 the Wolfson Foundation donated £350,000 for the establishment of a new Biochemistry Department.[citation needed] A special relationship between Imperial and the Indian Institute of Technology Delhi was established in 1963.[citation needed]

What site did Imperial acquire in 1947?