BRIDOL is the British Sundial Society's Register of Fixed and Mass Dials, which gives detail and photographs of about 8000 fixed sundials and 3000 mass dials in the UK.
Some of these are in private gardens, but the majority are publicly available.
Known as Queen Mary’s Dial, it is in the Queen’s Private Garden and the finest dial known of its facet head class. It is a sandstone prism 1ft 6ins high standing on its point, with 20 triangular facets, elaborately carved with coats of arms & monograms of King Charles I & his Queen Henrietta Maria. There are various bowl, heart and triangular sinkings with dials, in some of which the nose of a carved face acts as a gnomon. There are also open fret worked metal gnomons, and some also formed in the stone. The top of the pedestal is an inverted hemisphere above a square column decorated with acanthus leaves and mounted on three high spreading octagonal steps (probably later than the dial). The dial is dated 1633 and was made by John Mylne III, Master Mason to Charles I. It was made for the Scottish Coronation of Charles I. Royal Accounts show that it cost £408 15s 6d (Scots) plus further charges for painting and gilding, this additional charge illustrating that at the time it was customary to paint these stone sculptures. It was restored in Queen Victoria’s time and cleaned recently to 1986.
Ref: A R Somerville, ’The Ancient Sundials of Scotland" p244 & Proc Soc Antiq Scot 117 1987.
