A Rare Naval WW1 Period Convex Parabolic Mirror / Reflector By G A Parsons And Co LtdOrigin: English Period: Early 20thC Provenance: Unknown Date: c. 1915 Diameter: 22 Depth: 2 The rare first world war period convex parabolic mirror or reflector, with a later rope twist frame, the plate having etched marks around the circumference partially reading C A Parsons & Co 1915, with the back boards dated to 1947, the whole surviving from the first quarter of the twentieth century. The mirror is in useable order only with minor spotting and