Imperial system - Imperial system (English spelling) foot-pound-second system

Japanese: ヤード･ポンド法 - ヤードポンドほう（英語表記）foot‐pound‐second system

The measurement system of English-speaking countries is composed of the yard, pound, and second as base units. It was originally the British system of weights and measures, and its origins are ancient and multi-dimensional, with many dating back to the time of the Roman conquest. It began to be developed in the 1580s under Elizabeth I, and came to be used around the world as Britain developed internationally. In 1824, the Weights and Measures Act was enacted in Britain, and a unit system similar to the modern Weights and Measures Act was created in the country. However, at that time the size of the base unit of capacity was completely changed, which led to differences with other countries that used units based on the old standard equipment, and each country began to use its own unit system.

Source: Heibonsha World Encyclopedia, 2nd Edition Information

Japanese:

長さの単位ヤード，質量の単位常用ポンドおよび時間の単位セカンド(秒)を基本単位として構成された英語圏諸国の計量単位系。元来はイギリスの度量衡単位系であり，その起源は古くかつ多元的で，多くはローマ帝国征服期にさかのぼる。エリザベス1世の1580年代に整備されはじめ，イギリスの対外的な発展とともに世界各地で使われるようになった。1824年にイギリスで度量衡法が制定され，同国内ではほぼ現代の度量衡法に近い単位系ができあがるが，このとき容量の基本単位の大きさを一新したため，旧来の標準器の系統の単位を用いてきた諸国との間に相違が生じ，各国で独自の単位系が使われるようになった。

出典　株式会社平凡社世界大百科事典第２版について　情報

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