These cannons are a 6 inch (150mm) breech loading naval gun dating pre 1913. for display it uses 1 kg of black powder and 100 grams of napthelene which gives a little extra flame and bang. thankyou motabikeboy for the info. :)
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On the 26th September 2005 the Coal River Working Party drilled into the early convict coal mines of Newcastle Australia. This is the birthplace of the Australian Coal Mining Industry. Video by Bob Cook. For more info:
http://www.newcas tle.edu.au/coalriver
Blog: http://coalriver.wor dpress.com/