(解説文要約)
修繕方と呼ばれる坑内鍛冶屋が、蒸気を送り込むパイプの結合部を作っています。
パイプを接続するためにパイプの端にフランジと呼ばれる輪っかを取り付けます。
蒸気が漏れないように叩いてフランジとパイプをしっかり密着させ、ボルトで締めつけます。
This is a painting depicting the coal mine blacksmith, called "Shuzenkata", making a joint for steam pipes.
At the end of one pipe, he attaches a round ring called a flange to connect it to another pipe.
Next, he hammers the joint of the flange and the pipe to attach them firmly.
Finally, he secures the joint by fastening bolts to it.