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.
IIII - XII - VIII, from outside, inner divided to quarters and half hours with three-arrow markers; outer to 2mins which are marked 20-40-60. Diamond half-hour marks. Gnomon angle 51 degs. Signed ’J Hurt, LONDON’.
