OCR Text |
Show The Rnstleag Process for Kettles. The rustless process, which has been until lately an experiment, has now demonstrated that great economy can be used, not only in iron pipes, but in every article where iron is used. Over 2,000,-000 2,000,-000 kettles have been subjected to this process in Pittsburg. The method is very peculiar. After the article is made it is put into a furnace made in an oval shape, air tight. After the iron has attained at-tained almost a white heat, the air that comes through the regenerators and air valves is shut securely oft, and the furnace fur-nace is made air tight. After the air has been shut off the superheater, which is located in the combination chamber at the rear of the furnace, and at right angled an-gled from the air valves, is opened, and the furnace is filled with steam and kept in that condition for eight hours. At short intervals a small valve is opened, so as to allow the exodus of steam in the furnace, allowing fresh steam to be put into it. When the articles have been about ten hours in the furnace there has been accomplished the formation of magnetic oxide upon the iron surface. They are then put into an acid well, which is the last treatment. Exchange. |