A Jones Gray & Co Liverpool early 19th century ebony and brass octant with ivory makers plaque stamped Jones Gray & Co Liverpool. Lacquered brass fittings including two pinhole sights, five shades and mirrors, the index arm 26 cm radius with vernier tangent screw and clamp, the arc with an ivory scale, no provision for a handle which marks this item as a transitional piece between an octant and a sextant, mahogany stair-step cased with trade label for John Parkes & Sons, Liverpool