An early 19th Century 11ins.(28cm) radius ebony Octant,
by Spencer & Co, London. Reading from -2 to 105 degrees on the ivory scale, the brass index arm fitted with an ivory vernier to 20 seconds. Fitted with pinnule sight, one horizon and three sun shades. In a fitted keystone mahogany case bearing a trade label from RW Cousens, Swansea.