From Adelaide, South Australia, Bob Abercrombie sends this photo from the 60's with this explanation;
The last photo was taken by me in about 1960 on the Port River. A couple of Rainbow scows and Cadet junior dinghys feature. The old steamship is the S S Karatta which carried freight and day passengers from Port Adelaide to Kingscote, Kangaroo Island from 1907 to 1961. It was then replaced with a roll on roll off ferry.