A lacquered brass and ebony double'T'frame octant, signed on the makers ivory plaque J. SOMALVICO & CO LONDON, the index arm with 10½ inch radius, framed vernier and magnifier, tangent screw and clamp, inset ivory scale divided 0-135, telescope mount with screw attachment, star telescope, seven shades and mirrors, on three tapered pillar legs in shaped and fitted mahogany case - 12 7/8in (33cm)wide