Operating room at Awanui wireless station with “acoustic receiver” with contact detector (a silicon/gold combination in a sealed cartridge – a semiconductor, in fact). The high-tension room (through the window at the right) included the aerial switch which can be seen, along with the lever to operate it from the operator’s desk. Photo: Awanui Scrapbook, Te Ahu Museum Operating room at Awanui Radio VLA, date unknown. The spark gap transmitter is see through the window at right, and part of a control panel can be seen at left. Photo: Awanui Scrapbook, Te Ahu Museum Part of the transmitter switchboard, located to the left of the operating desk.