. Transactions. Fig. 16.—Norway iron treated 20 hr. at (350° C. in synthetic ammonia, SHOWING TYPICAL SMALL NEEDLES. EtCHED 10 SEC. WITH 4 PER CENT. NITRIC 500. H. E. WHEELER 269. Fig. 17.—Same as Fig. 10, showing typical large xeedlk-, IvrcutD 10 sec. WITH 4 PER CENT. NITRIC ACID. X 500.

---

Size: 1678px × 1489px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No

Keywords: ., bo, bookcentury1800, bookdecade1870, booksubjectmineralindustries