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copy which was corrected in 1900. Earlier versions do not, apparently, show the two Obelisks. It seems then that the two Obelisks were erected in their present forms at the end of the 19th century. I was, however, told by a Chinese Chief Inspector of the Royal Hong Kong Police, at the informal meeting organised by Chatwin, that at one stage in his career the Chief Inspector had served in the Tai Tam district. There he had met an elderly, retired police officer who informed him that, before the two concrete Obelisks were constructed, two timber obelisks stood in about the same places. This is purely oral history and, although it may well be true, I have not been able to trace anything more about them. Joseph Aspdin did not invent artificial Portland cement until 1824, in Britain. It would take time for its use to spread around the world. This meant that if obelisks were erected in the middle of the 19th century, in Hong Kong, they would likely have been made of some material other than cement concrete.
The two beacons were probably used by shipping, then, as navigational aids when entering the Bay, and sailing on into the Harbour, to avoid hazards or for use in times of bad visibility. In a Government Antiquities and Monuments Office paper a master mariner, Mr A Davidson, is quoted as saying that following the courses of the two Obelisks, 'in line,' results in a course which clears a patch of rocks lying across the entrance to Tai Tam Bay. These rocks, he states, are now lighted (Antiquities and Monuments Office, 1980).
Bearing in mind that just about all useful records from the Government Harbour Master's Office and the Public Works Department were lost during the Japanese occupation (1941 to 1945), it has not been possible to trace who erected the two Obelisks although attempts have been made to do so (Lack, 1994). It could have been the Public Works Department. It could have been the Royal Navy itself through its Royal Naval Dockyard. Until the late 1950s this was situated where Admiralty is today, in Central District. If it was the Royal Navy one would have thought there would have been some marking on the Obelisks, such as the Admiralty fouled anchor. One would also perhaps have expected the concrete finish of the Obelisks to have been better although they have stood the test of time.
Could the Obelisks have been used for other purposes? Sometimes two sets, each comprising two beacons, are erected to clock ships in a