the polarisation properties of sunspot radiations, an area of active investigation as the Sun was recently confirmed to be radio bright during World War 2. Bolton built two Yagi antennas and installed them at Dover Heights, Sydney. However, the Sun had entered a dormant period, with no sunspots on its surface. Having learnt of the discovery of radio emission from the plane of the Milky Way during his time at Cambridge University, and from observations onboard HMS Unicorn, Bolton speculated that there might be other radio bright stars like the Sun. Following his intuition, Bolton and his colleague Bruce Slee pointed the two Yagi antennas towards the horizon and used the instruments as a sea-cliff interferometer to gain greater resolution than possible by using the antennas by themselves. Such a decision lead to direct conflict with Bolton's boss Joe Pawsey, who reassigned Bolton to help design Yagi antennas for a potential Solar eclipse expedition after finding the antennas not pointing at the Sun. However, the expedition collapsed and Bolton was again ordered to observe the Sun with the new equipment during the day, but was permitted to use the equipment at night to investigate other potential radio sources. Through discussions with Pawsey, Bolton learnt there had been conflicting reports about a radio source in the constellation of Cygnus reported by Stanley Hey. With Gordon Stanley, the pair completed a shallow survey of the southern sky with the sea-cliff interferometer. They confirmed the existence of the bright Cygnus source, later named Cygnus A, but at a position substantially different than that reported by Hey, and two weaker sources near the constellation Centaurus and at the edge of Cygnus. It was also during these nighttime observing runs that Bolton largely self-taught himself astrophysics using recent publications in The Astrophysical Journal. With the sea-cliff interferometer, Bolton and Stanley achieved a resolution greater than 15 times than that of Hey's observations. They could be confident that the radio emission in Cygnus came from an area less than 8'. While Hey is credited with the discovery of the first radio 'star', Bolton's result confirmed Hey's conclusion that the source had to be compact. In tandem, these results represented the beginning of the science associated with discrete radio sources. Further observations produced a refined position for Cygnus A but no convincing optical counterpart, such as a bright star, was found. Radio stars Following the Cygnus result,