Signalling Subject Eastern Channel Pile Light Western Channel Pile Light Detail of chart showing Sow and Pigs Reef and lightship 1881 Fort Phillip and the Signal Staff 1842 Georges Head Light, precast top being placed on pile foundation 27 March 1924 Letter to the editor of the Sydney Times on the loss of the Edward Lombe 1834 No.2 Port Jackson N.S.W. The Floating Light - (Morning), 1846 Observatory and the signalling station, Observatory Hill, Sydney 1870-75 Sow & Pigs Reef at low tide May 1950 Women's Emergency Signalling Corps members at Castle Hill c1939