ETNA  , a

borough of Allegheny county, Pennsylvania, U.S.A., in the western part of the state, on the W. bank of the Allegheny river (about 5 m. from its junction with the Monongahela), and about 2 M . N. of the city of Pittsburg, of which it is a suburb . Pop . (188o) 2334; (1890) 3767; (1900) 5384 (1702 foreign-born); (1910) 5830 . It is served by the Pennsylvania railway and by electric lines . Among its industrial establishments are .rolling mills, tube and pipe works, furnaces, steel mills, a brass foundry, and manufactories of electrical railway supplies, boxes, asbestos coverings, enamel work and ice . The city's industrial history dates from 1820, when a small factory for the manufacture of scythes and sickles was set up . Natural gas, piped from Butler county, was early used here as a fuel in the iron mills . Etna, formerly called Steuart's Town, was incorporated as a borough in 1869 .