A 10in(25.5cm)radius Ebony Octant,
by JM Kleman & Zoon, Amsterdam. Reading from 0 to 115 degrees on the engraved ivory scale, the brass index arm with ivory vernier to 20 seconds. Numbered 8 on the cross arm and box. Fitted with three sun and two horizon shades. In a keystone oak and mahogany case, with telescope and dark lens.