Twentieth century handbook for steam engineers and electricians, with questions and answers; a practical nontechnical treatise .. (1916)
Swingle, Calvin F. (Calvin Franklin), b. 1846 · Chicago, F.J. Drake & company · leaf 211
it. Heaters which uselive steam direct from the boilers heat the feed water to amuch higher temperature, so that they act as purifiers byremoving a large portion of the scale-forming impuritiesbefore the water enters the boiler. Live steam heaters,however, are not to be considered as economizers of… … Mechanical Stokers 199 made for the regulation of the supply of fuel according tothe demand upon the boiler for steam; also that the in-termittent opening and closing of the furnace doors, as inhand firing, thereby admitting a large volume of cold airdirectly into the furnace on top of the fire, is…
![An illustration from Kulturgeschichte ... Vierte Auflage. Neu bearbeitet von M. von Brandt [and others], etc (1896)](https://img.insideoutlibrary.com/img/200/bl-bl_001644661_4-485-1.webp)
