how many bolts are in the sydney harbour bridge
Sydney Harbour Bridge The bridge is held together by six million Australian-made hand-driven rivets supplied by the McPherson company of Melbourne,[14][15] the last being driven through the deck on 21 January 1932.[13][16] The rivets were heated red-hot and inserted into the plates; the headless end was immediately rounded over with a large pneumatic rivet gun.[17] The largest of the rivets used weighed 3.5 kg (8 lb) and was 39.5 cm (15.6 in) long.[12][18] The practice of riveting large steel structures, rather than welding, was, at the time, a proven and understood construction technique, whilst structural welding had not at that stage been adequately developed for use on the bridge.[17]
History of Australia (1788–1850) On 13 May 1787, the First Fleet of 11 ships and about 1,530 people (736 convicts, 17 convicts' children, 211 marines, 27 marines' wives, 14 marines' children and about 300 officers and others) under the command of Captain Arthur Phillip set sail for Botany Bay.[8][9][10] A few days after arrival at Botany Bay the fleet moved to the more suitable Port Jackson where a settlement was established at Sydney Cove on 26 January 1788.[11] This date later became Australia's national day, Australia Day. The colony was formally proclaimed by Governor Phillip on 7 February 1788 at Sydney. Sydney Cove offered a fresh water supply and a safe harbour, which Philip famously described as:[12]