Painting. Lord Penrhyn's slate quarry near Bangor / John Nixon. - 1807. - Watercolour; 14x20.7cm, in gilt frame 36.8x42.1x2cm. - Signed with initals and dated 1807, dated 1808 on reverse and inscribed reverse "observe to reduce the distant figures at the end of the Quarry - they are much too large"