"Sir Thomas’s first observatory was completed in 1808 at his estate in Brisbane Glen, near Largs in Ayrshire, Scotland.
It was one of only two Scottish observatories then, and was the best equipped." John Bonsor, Scotland
http://www.sydneyobservatory.com.au/...-in-australia/
http://goo.gl/maps/h6v72
http://binged.it/PoLMqE
"In the Brisbane Glen, there is another smaller pillar in the field near to his observatory,
which was originally a device through which the 3 Sisters could be sighted, and due north established."
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ttp://www.britishlistedbuildings.co.uk/sc-7312-brisbane-mains-meridian-pillar-largs
http://www.largsonline.co.uk/3sisters.html
http://www.britishlistedbuildings.co...ers-meridian-p
http://goo.gl/maps/hPFPs
The 3 sisters were used to find due south from Brisbane's observatory, not due north.