A rare double index arm reflecting circle, signed on one arm Stackpole & Brothers, New York 2323 and C.H. TOWNSHEND PATD JANY 31 1888, double index mirrors one above the other, horizon glass silvered above and below the transparent middle section band, tangential screw controlled telescopic arms to each index arm, swivel lens to the three vernier scale, inverting sun telescope, star telescope, screw-on handle, other accessories in fitted mahogany case - 11in.(28cm)square