Joeki found a formula for making an alloy of copper, tin and lead which was technically very difficult, and among the successive heads of the Nakagawa family, he was recognized as the master of cast metal who left numerous fine works.
技術的に困難であった砂張（さはり：銅・錫・鉛の合金）の製法を発見して多くの名品を残しており、歴代の中でも鋳物の名人として知られる。