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Published online by Cambridge University Press: 14 August 2015
The previous unsuccessful attempts to detect the 327-Mc/s line of galactic deuterium [1, 2] were limited in sensitivity either by the size of aerial or by the inability to use long integration times with a large fixed aerial. The new observations reported here were made with the 250-foot radio telescope at Jodrell Bank, which can continuously follow a source of radiation; moreover, the effective integration time was improved by using a multi-channel receiver instead of a swept-frequency one.