Karagwa - Karagwa

...Uchiguwa are made sturdy and heavy to withstand the impact of driving in and to provide inertia, and are used for general tilling and other soil preparation, but there are also large bath hulls called kuroguwa that are made especially for civil engineering work. There are also thick-bladed metal hulls called karaguwa for land clearing and civil engineering work, but there are also pickaxes with narrow blades for digging in particularly heavy, sticky soil. Bitchu hulls evolved for use in tilling wet, clayey rice paddies, but they are designed to penetrate the soil easily when driven in and to reduce the soil's adhesive resistance. ...

*Some of the terminology explanations that mention "Karagwa" are listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

…打ちぐわは，打込みの衝撃に耐えるのと慣性力を持たせるため堅固に重くつくられ，一般耕起など土起しに用いられるが，とくに土工用に大きくつくられた黒ぐわと呼ばれる風呂ぐわがあった。また，開墾や土工用には唐ぐわと呼ばれる刃の厚い金ぐわがあるが，とくに重粘で固い土を掘るためには刃幅を細くしたつるはしがある。備中ぐわは，湿った粘質の水田の耕起用として分化したが，打ち込むとき土に貫入しやすくかつ土の粘着抵抗を少なくしたものである。…

※「唐ぐわ」について言及している用語解説の一部を掲載しています。

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