Quadrant on pillar stand.

Quadrant on a stand made by B.C. Phelps, United States, 1861. Polished brass frame and index arm. Signed on the left strut: B.C. Phelps | 1861. Polished brass scale from 0° to 93° every 20'. Silver vernier to 1', zero at the left. There is no tangent screw; the clamping screw is on the back of the index arm. Two index shades (both red) on a swivelling arm. The index glass, without adjustment, is fixed at the pivot; there is no horizon glass. The sight vane has one pinhole, and is fixed at the bottom of the index arm, at the 0' of the vernier; a second sight vane with two cross-wires is fixed on the index arm just below the pivot. A detachable bubble level in a brass case is clamped on to the left strut (a later addition probably by a different maker). The quadrant is fitted on a column and can be rotated in the horizontal plane, and secured by a milled knob. The stand consists of a painted brass column on three painted brass feet levelled by milled screws.