161109 ⎘
Furnaces through which the charge is moved mechanically, e.g. of tunnel type ; Similar furnaces in which the charge moves by gravity characterised by the path of the charge during treatment; characterised by the means by which the charge is moved during treatment the charge moving in a substantially straight path tunnel furnace under the action of scrapers or pushers on rails, e.g. the charge being subjected to an additional manipulation along the path