（解説文要約）
坑内は常に排水をしなくてはいけません。
描かれているのは、明治中頃の手動ポンプでの排水作業の様子です。
大変な重労働だったそうで、作兵衛翁は「人間エンジン」と表現しています。
One obstacle that hindered mining was spring water, and its removal was always a major issue for the miners.
Depicted in this painting are two men pumping out water around 1890.
It was such hard labor that Sakubei described them as "human engines".