Operation Totem km north west of Woomera, South Australia. A natural claypan known as the Dingo Claypan provided a ready-made airstrip. In August 1952, Sir William Penney, the Chief Superintendent Armament Research (CSAR) at the British Ministry of Supply, and the head of the British atomic weapon development effort, notified W. A. S. Butement, the Chief Scientist at the Australian Department of Supply, of his intention to visit the site before the Hurricane test. Butement warned Penney that it was very remote, and that Beadell and his companions might well have been the first non-Aboriginal people to see the area. Sir John
Residual-current device to the appliance. The test button (8) allows the correct operation of the device to be verified by passing a small current through the orange test wire (9). This simulates a fault by creating an imbalance in the sense coil. If the RCD does not trip when this button is pressed, then the device must be replaced. Residual-current and overcurrent protection may be combined in one device for installation into the service panel; this device is known as a GFCI (ground fault circuit interrupter) breaker in the USA and Canada, and as an RCBO (residual-current circuit breaker with overload protection)