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Sidney Jeffryes
Sidney Jeffryes (born c. 1885), was an Australian spark-gap radio operator. He is best known for his service as the wireless officer at Cape Denison during the second year (February 1913 − December 1913) of the Australasian Antarctic Expedition under the command of explorer Douglas Mawson. His service ended in September 1913, two months prior to the relief of the shore party, when Jeffryes developed symptoms of paranoia and had to be relieved of his duties.
==Biography==
Jeffryes, from Toowoomba, Queensland, had qualified as a wireless operator with the Australasian Wireless Company and was in his late 20's when an appeal was made for a wireless operator to serve during the second winter of the Australasian Antarctic Expedition (AAE). A series of tragedies and mishaps had led to the Cape Denison shore base on Antarctica being kept open for a second winter, March–December 1913. As the radioman who had served in 1912−1913 was returning home, the expedition needed a new specialist.〔
The AAE expedition was the first Antarctic expedition in history, and the only one during the Heroic Age of Antarctic Exploration, to maintain radio contact with its country of origin. The equipment available in 1912 and 1913 did not allow the Cape Denison base to transmit directly to Tasmania. The expedition had also organized a second winter-over base, at Macquarie Island, which served as a radio relay station. By means of a two-step process, messages in Morse code were transmitted back and forth between Australia and the Antarctic coast.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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