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

TABLE XXXI.

Experiments on bar No. 16 boiler plate. Manufactured by Henry S. Spang & Son, at the Etna Rolling Mill, near Pittsburg, Penn. The blooms made by Henry S. Spang, Huntingdon County, Pa. Ham

TABLE XXXI.

mered into slabs and then rolled into sheets. This bar was cut across the direction in which the sheet passed the rolls; reduced by filing, and gauged at every inch, from 0 to 22. Specific gravity, 7.7874.

22*