New reagent for etching mild steel: W. Rosenhain and J. L. Haughton. (Iron and Steel Inst., May, 1914.)

• Publisher: Elsevier Science
• Year: 1914
• Tongue: English
• Weight: 69 KB
• Volume: 178
• Category: Article
• ISSN: 0016-0032
• DOI: 10.1016/s0016-0032(14)90147-8

✦ Synopsis

Observations on the Burning of Porcelain. R. ~:~EINDEL. (Spreschsaal, xl, vii, 285.)--The behavior of an experimental oven was studied by the help of Seger cones, a pyrometer, a manometer, and the analyses of the oven gases. The readings of the pyrometer showed higher temperatures than those indicated by the cones, the difference amounting sometimes to ioo ° C. at the commencement of the heat and diminishing at later stages. Temperature curves were not regular in their ascent, but dropped at every addition of fuel. The draught also varied from 25 to 5o mm. according to the condition of the fire. Analyses of the fire gases were conducted at cone oga , the point at which they begin to influence the character of porcelain. A content of 3 to 5 per cent. of carbon monoxide is necessary at this temperature, but at cones 8 or 9, one per cent. is sufficient to maintain the reducing character of the oven atmosphere so far as regards porcelain.