Molten lead at 800°F is shown being “puddled”, a process originally used to make steel from pig iron

Fabricating the Multi-Channel Carbon Counter

After being poured into a form for the counter’s side shield, molten lead at 800°F is shown being “puddled,” a process originally used to make steel from pig iron. During the process, cooled lead is heated, or torched in this case, liquifying it to sink and fill in any trapped air holes. At the same time, additional molten lead is being added to maintain the volume.