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]
First Fleet On 26 January 1788, the Fleet weighed anchor and sailed to Port Jackson.[25] The site selected for the anchorage had deep water close to the shore, was sheltered, and had a small stream flowing into it. Phillip named it Sydney Cove, after Lord Sydney the British Home Secretary.[43] This date is celebrated as Australia Day, marking the beginning of British settlement.[46] The British flag was planted and formal possession taken. This was done by Phillip and some officers and marines from the Supply, with the remainder of Supply's crew and the convicts observing from on board ship. The remaining ships of the Fleet did not arrive at Sydney Cove until later that day.[47]