THE i Commercial and Agricultural Magazine.;
tI RC TATO
No. XXVITTÍ.] NOVEMBER, 1801„[VoL, V-
For the Commercial and Agricultural Magazine.
METHOD OF PREPARING THE FAMOUS BRESCIAN STEEL, AS IT IS PRACYISED IN STYRIA, AND CORINTHIA 5 BY B. F. HERMAN, PROFESSOR OF TECHNOLOGY, AND MEMBER OF SEVERAL LEARNED SOCIETIES:: WITH AN ENGRAVING OF THE APPARATUS.:
N(Deſcription of the Plate.) ) HIS Plate repreſents, 1.‘The foundation; 4 ſquare. ſtone 3 feet broad, and 11 feet thick. 2.‘The hearth, which is, in one direQion, 22 inches broad, in the other, 20 inches, 3: The moulds; made of copper, in the form of an half moon, nearly 90 pounds in weight, rinz-to tie Nelsht of 11 inchés-abdye the foundation, or floor; and making wich if 4184 an âpgle 6f Troß degrees. Soinetimes moulds' are uſed which weigh ſcarce 60 pounds. 4. The intefior expanſe of the oven, or furnace, i Ieeto Inches in diameter, 5. The upper extremity of the furnace, 22 inches ſquare, 6. The inner wall of the furnace, built here of certain limé- ſtones, which reſiſt the force of fire.
4 7. The exterior heaJ-wall.:
8. The chimney, 28 feet high; And pointed at the’ top.
9. The bellows; conſiſting of two ſides, or parts, of leathet, each Ior feet in length, 4 feet 2 inches broâd, at the pôſ- terior part, and on the anterior 18 inches broad; in height, 42 feet. The draught of the bellows terminates in, a pipe, ór nozzle, which is 3 feet 8 inches long, and in diâmeter, on its upper part 9 inches; at the very extremity, 12 inch, Some
: think it better to uſe bellows I foot longer, and broadet behind by 6 inches,—by 3 inches wider at the nozzle; ſo as to Aug ment the force of the blaft.:
10. The paſſage, by which the melted metal runs of into the reſervoir, or fluxióg-bed, prepared to receive it,
11. An arch, under which is the reſervoir for the Auxed metal, and under which the manager of the bellows as.
12. Another arch, under which the bellows moves.
[M The whole height of the furnace, from the ground to the
| roof, is 24. feet.
| Com,& Ag. Mag. Vol. FV, Rr