NT Washington Old Hall: 1676 dial
NT Washington Old Hall: 1676 dial

Detail of the 1676 dial showing the new gnomons at south and west. This is a vertical 'corresponding' type of dial - each of its three vertical dials should show the same time when the sun reaches it. The gnomon on the left hand west-facing dial has its edge parallel to the more familiar triangular gnomon of the south-facing dial.

NT Washington Old Hall: 1676 dial

Detail of the 1676 dial showing the new gnomons at south and west. This is a vertical 'corresponding' type of dial - each of its three vertical dials should show the same time when the sun reaches it. The gnomon on the left hand west-facing dial has its edge parallel to the more familiar triangular gnomon of the south-facing dial.