英語訳
**Volume 2, Folio 12 Verso**
*Problem 41: The total thread length in one tan of silk / cloth*
**One tan of silk:**
┃ Total: 7 ri, 10 chō, [35 man] 5 shaku, 3 sun
《Marginal note: Of which, the warp (tate) length is 4 ri, 11 chō, 4 ken, 4 shaku | Of which, the weft (nuki) length is 2 ri, 35 chō, 31 ken, 1 shaku, 3 sun》
**Method:** The number of warp threads is 1,800. The length of one thread is 2 jō, 8 shaku. Converted diagonally (kane), this is 3 jō, 3 shaku, 6 sun. Multiplying this by 1,800 gives 6,048 jō. Dividing this by 6 shaku, 5 sun gives 9,304 ken, 4 jō. Dividing this by 60 ken gives 155 chō, 4 ken, 4 shaku. Dividing this further by 36 chō gives **4 ri, 11 chō, 4 ken, 4 shaku**, as determined.
○ For the weft threads: the width of the gofuku (woven silk fabric) is 1 shaku, 3 sun, and converted diagonally (kane) it is 1 shaku, 5 sun, 6 bu. Reckoning 8 threads per bu, multiply 1 shaku, 5 sun, 6 bu by
**Volume 2, Folio 13 Recto**
8 threads to get 1 jō, 2 shaku, 4 sun, 8 bu. Multiplying this by 3 jō, 3 shaku, 6 sun gives 4,193 jō, 2 shaku, 8 sun. Dividing by 6 shaku, 5 sun gives 6,451 ken, 1 shaku, 3 sun. Dividing by 60 ken gives 107 chō, 31 ken, 1 shaku, 3 sun. Dividing this again by 36 chō gives **2 ri, 35 chō, 30 ken, 1 shaku, 3 sun**, as determined.
┃ **One tan of cloth woven in a nine-thread weave (kokonotsu-iri):** The length in gofuku measure is 2 jō, 8 shaku; the width is 1 shaku.
《Marginal note: Warp and weft combined: 3 ri, 6 chō, 43 ken, 2 shaku, 5 sun | Of which, warp: 1 ri, 26 chō, 1 ken, 5 shaku, 5 sun | Of which, weft: 1 ri, 16 chō, 41 ken, 3 shaku, 5 sun》
**Method:** Reckoning 5 threads per bu (diagonally/kane), the calculation procedure is the same as described above (to the right).