A Georgian brass pocket sundial compass, also known as a 'Pantochronometer' or 'Magnetic Dial', dating from c.1840. The term pantochronometer was apparently coined in the early 19th century by Charles Essex & Co. of Clerkenwell, London. A floating sundial compass was patented by the London instrument maker Samuel Porter in 1824, who referred to these instruments as 'Magnetic Dials' and labelled them to that effect on the base. Sundial compasses are known to have been made in Europe in the late 18th century. Further details of the history of pocket sundials can be found at the excellent compassmuseum.com website.
This instrument features a cylindrical brass case and floating sundial compass card, incorporating a brass gnomon under a flat glass. The compass is in full working order and finds North well.
In good condition, full working order and finds North well. The brass case is in good condition, with general signs of age and wear. The paper compass card and brass gnomon are in good condition. The glass is in good condition, with some wear at the edges.