It can be imagined that the enough heat amount to melt a piece of cast iron for repairing the pots and rice cookers casted by cast iron with a low melting point in those days could be obtained by such a simple equipment.
融点の低い鋳鉄で鋳造された当時の鍋・釜を直すために鋳鉄片を溶融しうるだけの熱量は、これぐらいの装備でも確保できていたのだろう。