https://www.researchgate.net/profile/Un_Chul_Moon/publicatio...


he primary feature is a melter constructed of refractory brick that has a high melting point and provides a high degree of insulation.

A series of oxy-fuel burners directed into the side of the melter combine natural gas and oxygen, raising the internal temperature of the melter to 2,900 degrees Fahrenheit.
http://www.minergy.com/wp-content/uploads/melter-cutaway.gif
https://www.minergy.com/technology/glass-furnace-technology/

The Melter is a rectangular basin in which the actual melting and fining (seed removal) takes place. In a side-fired furnace, the batch is charged into the furnace through the doghouse, which is an extension of the melter, protruding from the back wall. Along each side of the melter, above glass level, are three to seven ports, which contain the natural gas burners and direct the combustion air and exhaust gases.

https://www.gpi.org/glass-furnace-operation

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The third break-through was the continuous glass tank. This uses no pots at all, but raw material is fed at one end of a melting basin and the molten glass is extracted continuously in the opposite end. But this type of furnace was far out of reach for the small Swedish glassworks.
https://bergdala-glastekniska-museum.se/eng-glasugnar.html