This historic trig point is about 17 miles south of Bourke, (Outback NSW), on the Mitchell Highway. The inscription on the plaque at the base of the unit reads.
“Bourke North Base
This survey beacon, built in 1915 is the Northern end of an accurately measured Trigonometrical Base Line, 30 km long, which was Australia’s first National Mapping Scheme.
The Southern end of the base is toward Byrock and just off the highway. the base line was laid out in 1911. This beacon was intervisable with South Base and Moira Trigonometrical Station on Mount Oxley.
The whole process of measurement and check measurement between bases took surveyors more than two months, including three weeks to clear the lines, defining the alignment and placing pegs every 24 metres.”
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