HARRIS, familiar with the trade with China, considered 1 ryo in Japan to be 1 ryo (tael; 37.3g) of silver just as 1 ryo in China, and drew his conclusion also from the fact that a one-dollar silver coin weighed about three fourths of a tael and an ichibu-gin silver coin happened to weigh about one fourth of a tael.
また中国との交易に精通していたハリスは日本の一両も中国と同様に銀一両（テール/37.3グラム）と考え、1ドル銀貨は約3/4テールの量目に相当し一分銀の量目が偶然にも約1/4テールであったことも1ドル＝3分の根拠としての口実となった。