It is a while since I added to my collection of sundials so here are a couple for the list, including my first Heliochronometer, but unfortunately neither of these are in good condition or in a suitable position at Oxenfoord Castle. 

Until time was standardized in the 1880s due to the expansion of railway timetables. sundials were not entirely accurate.  Gibbs designed a Heliochronometer which was able to accurately determine GMT to within a minute at any time of the year and at any latitude between 38 and 60 degrees.  About 1000 were made until the war in 1914 stopped production and there are very few left as many were recycled for their metal in WW2.  This one has the number 730 and was made around 1911 with an inscription stating Robert Burns “ Nae man can tether time or tide.”   If you are interested to see how it works there are very good explanations here.  

The other sundial that I saw also looked abandoned.  It is a cube dial with dials on three faces on a square pedestal with a bear on each face.   It is such a shame that these are not being shown off to advantage and a pity that the rare Heliochronometer is not restored.

These are numbers 32 and 33 of my sundials which can be seen in the mysundials tag