For sale, an exquisite maritime black glass artificial horizon set by John Lilley & Son, LondonThe base of the instrument takes the form of a brass rectangular tray which is inset with a mirror finished black glass plate with bevelled edge. The plate three pointed feet which are clamped to each side and screw threaded in order that they can be adjusted to a level position.The plate is accompanied by a large brass spirit level with a flattened base so that it can be rested upon the plate to assist the use in creating a level platform for navigational observations.The instrument is housed in a superb fitted mahogany case which provides three stabilisers for the feet of the instrument to reduce movement in transit and a semi-circular mount on each side of the case to hold the level in place underneath. The baize lined struts that emanate out from the lid also close over the top of the level effectively locking its position.The lid also bears a wonderfully complete trade la...