Hi Sonia,
Just been looking up ancestry on net and came upon yr posting. My maiden name Imlach and descendent of William. My sister, Derena (Hobart) has original copy from log book entry when William came out to Australia in 1848. She may be able to help!
timandderena@bigpond.com.au Her daughter recently did ancestry for school studies....interested to find which arm you came from.
Karen Kendall