English: A pair of Australian signallers, each wearing a headphone set, are listening in on an early Marconi Mk III crystal shortwave tuner set. The men are probably conducting a training excercise at the signalling school at Broadmeadows, Vic. The banded pole (right) supports an aerial. Identified, but position unknown is 1349 (later Staff Sergeant) Albert Joseph Egan, who ended the war attached to 3 Squadron, Australian Flying Corps, (AFC). Note the wooden lid to the wireless set in the background. The Marconi Mk III crystal shortwave tuner set could receive only, and was developed in 1915. It was used during the First World War until it was superceded by superior models such as the Marconi Mk IV set, which could receive and transmit.