TABLE XXIX. Huntingdon County, Pa. Hammered into slabs, and rolled into sheets. Specific gravity of the specimen from which it was cut, 7.7874. TABLE XXX. Experiments on bars Nos. 17, 18. 21, 22 and 23. Manufactured by Messrs. H. S. Spang & Son, at the into slabs, and rolled. Specific gravity, 7.77. TABLE XXX. Etna Works, near Pittsburg, from blooms made by H. S. Spang, of Huntingdon county. Hammered |