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sumi-ishi@
KEY WORD :@architecture / castles
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Also read kado-ishi p. Lit. corner stone. Long rectangularly hewn stones laid horizontally at the corners of a stone wall *ishigaki Ί_. For high stone walls hard stone is used and joined in a zipper pattern along the ridge at the corner of the wall. The size and number of the corner stones is determined by the overall height of the stone wall. The corner base stone is called sumikadobu ne-ishi p; the first corner stone above that is called ichiban sumi-ishi ԋ, the next stone is niban sumi-ishi ԋ and the next is sanban sumi-ishi Oԋ. The sumi-ishi is the main component of a corner stone grouping, along with *sumijiri-ishi K (corner tail stones), and sumiwaki-ishi e (corner side stones). Such corner stone groupings are termed sangizumi Zؐ, seirouzumi O or iketazumi 䌅. The way the stones are laid fuseyou l in these corner groupings is categorized as formal shin ^, less formal gyou s, and informal sou . For example, a formal sumi-ishi grouping is comprised of one corner stone joined with two or three corner side stones, carefully hewn and fitted in a row. The corner stone grouping supports the stone wall, so the size, number and placement of the sumi-ishi and other stones is carefully calculated, a process called ishigumi ishibakari Αgΐ}. See the drawing for the names of the various components of the corner of a stone wall. Contrast sumi-ishi with flat stones *hira-ishi , the other main type of stone used for stone facing.
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a) sumi-ishi ΁@b) sumiwaki-ishi e΁@
c) *sumijiri-ishi K΁@d) *hira-ishi

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