Figure 3. Dr Narain shown setting up an Askania magnetometer and chart recorder for automatic continuous recording of diurnal variations. Source: National Archives of Australia. Figure 4. Dr Narain using a count scaler connected to a Geiger counter to measure the radioactivity of uranium ore samples from Rum Jungle in NT and Radium Hill in SA. Source: National Archives of Australia. Figure 2. An example plot of one of the gravity traverses from Marshall and Narain (1954). 33 PREVIEW Feature Australia’s second lecturer in exploration geophysics FEBRUARY 2019