CAMBRIDGE, a city of eastern Ohio, U.S.A., on a hill 800f t. above sea-level ; the county seat of Guernsey county. It is on Federal highways 2I, 23 and 4o, and is served by the Baltimore and Ohio and the Pennsylvania railways. The population in 1920 was 13,104, (92.9% native white) and was 16,129 in 1930 by Fed , eral census. Coal, oil, natural gas, clay and iron are found in the vicinity, and the city has important manufactures of iron, steel, tin, glass and pottery. The output of its factories in 1925 was valued at $9,243,898. The first settlers here came from the Isle of Guernsey in 1798. A town was laid out in 1806 and the city was chartered in