Appleton's dictionary of machines, mechanics, engine-work, and engineering (1861)
Appleton, firm, publishers, New York. (1852, D. Appleton & Co.) · New York : D. Appleton · leaf 706
sand is thrown on when the metal is only at the full red heat, it falls off without adhering; butwhen the white heat is approached, the sand begins to adhere to the iron; it next melts on its surface,over which it then runs like fluid glass, and defends it from the air; when this point has been… … 696 FORGING. however, considered a sign of a dirty fire or bad iron, as the purer the iron the less it is subject towaste or oxidation in the course of work. Iu welding two pieces of iron together, care must be taken that both arrive at the welding heat atthe same moment; it may be necessary to…
Mechanical engineering
Internet Archive · Smithsonian Libraries · Public Domain Mark 1.0. Free to use for anything.
![An illustration from [Graphophone patents] (1878)](https://img.insideoutlibrary.com/img/200/ia-graphophonepaten07unit-1069-678.webp)
