“ In an hour of hard labor using a handmill, ” states the author, “no more than 0.8 kg [almost two pounds] of flour is produced from 1 kg [more than two pounds] of wheat.
Pengarang buku tersebut menyatakan, ” Setelah satu jam bekerja keras menggiling 1 kilogram gandum dengan gilingan tangan, tepung yang dihasilkan hanya kurang dari 0,8 kilogram.