One of the three ovens where the powder would be heater to over 2000 degrees… hot enough to fuse iron, but not hot enough to liquify it.

One of the three ovens where the powder would be heater to over 2000 degrees… hot enough to fuse iron, but not hot enough to liquify it.
The end of the heating line allowed glass to cool slowly, and thus be stronger.
Looking down the kiln line from atop the furnaces.
Part of a furnace control panel.