Napier, James, 1810-1884, Fesquet, A. A · Philadelphia : H. Carey Baird · leaf 54
fire it may be stated, that the black oxide of manganese is com- posed of Mn02; the high heat drives off, or sets at liberty, a portion of the oxygen, and the manganese is converted into a lower state of oxidation; so that 3Mn02 becomes Mn03,Mn 0 + 20. Another and more rapid method of preparing…
Dyes and dyeing · Coal-tar colors
Internet Archive · Getty Research Institute · Public domain (published before 1931). Free to use for anything.
![An illustration from [Graphophone patents] (1878)](https://img.insideoutlibrary.com/img/200/ia-graphophonepaten04unit-14-0.webp)
