E.R. WATTS & Son, London Brass stigmograph with three rulers. Signed and numbered 196. Length: 46.5 cm. Wear, scratches and minor knocks from use; a few spots of oxidation. With instruction manual "On the Station pointer and the manner of fixing a ship's position by its aid", London, J.D. Potter, 1903. In its mahogany case, same serial number, with two gilded brass clasps (stains, rubs, scratches, bumps, split; no key). Instrument used by hydrographic services for charting.