Circa 1800, this Illuminated Clock-Faced Tide Gauge, was invaluable to ships navigating the channels into Port Germein, South Australia.
A series of pulleys and levers, on the outside, rose and fell with the tide and a chain and wheel mechanism, inside, directed the hands to the appropriate channel depth measurement.
In 1989 new technology made it obsolete, but in 2013 it was restored. The only other Clock-Faced Tide Gauge was thought to have existed on the Tamar River, Tasmania.
It’s uniqueness puts it squarley in Becky’s squares.