ranges." The Court committed Jeffryes to the Ararat Asylum. His mental condition was diagnosed as paranoid schizophrenia while he was confined to the Ararat Lunatic Asylum in Ararat, Victoria. Letters from the health center, written to Mawson in 1915, testify to his challenges. Little is known of his later life. He died under confinement in 1942 from a cerebral haemorrhage. A plaque has been erected in the Ararat General Cemetery near to where he was buried. Legacy and late life Jeffryes' meticulous records of wireless reception quality during the second year of the Australasian Antarctic Expedition were correlated by himself, and by other expeditioners, with other observations of variables such as magnetic readings, auroral intensity, and St Elmo's Fire. These identified, perhaps for the first time, the impacts of Antarctic conditions upon low frequency radio wave propagation. The expedition's head and designated spokesman, Douglas Mawson, had little to say in his published histories about Jeffryes' active service in Antarctica. For almost 100 years, the unfortunate wireless operator's name was suppressed from most Antarctic records. But in August 2010, the Australian Antarctic Division honored Jeffryes for his pioneering winter service by naming a previously unnamed glacier after him. The Jeffryes Glacier is located at 67°4' South, 143°59' East, in the Australian Antarctic Territory. It should not be confused with the Jeffries Glacier. In December 2013, the first opera to be based on Mawson's 1911–14 expedition to Antarctica, The Call of Aurora (by Tasmanian composer Joe Bugden) was performed at The Peacock Theatre in Hobart. A chamber opera, The Call of Aurora investigates the relationship between Douglas Mawson and his wireless operator, Sidney Jeffryes. References Further reading Australian Antarctic Division. Home of the Blizzard, Sidney Jeffryes (Webpage) Online Australian Antarctic Division. Home of the Blizzard, Radio Waves (Webpage) Online Australian Antarctic Data Centre. Gazetteer, Jeffryes Glacier (Webpage) Online Ayres, Philip. Mawson: a life (1st ed. Melbourne, 1999) Trove NLA Google Books Carty, Bruce. Australian Radio History (4th ed. Sydney, 2013) Cormick, Craig. In Bed with Douglas Mawson: Travels Around Antarctica (New Holland Publishers, 2011) TroveGoogle Books Curnow, Geoffrey Ross. The history of the development of wireless telegraphy and broadcasting in Australia to 1942, with especial reference to the Australian Broadcasting Commission: a political and administrative study. online Friends of Mawson. Friends of Mawson. (Website) Online (excellent reading list and newsletter archive) Given, Donald Jock. Transit of Empires: Ernest Fisk and the World