The purpose of this paper is to clarify details of how a "Tosanjoden-zu" was drawn. Kozen Uramatsu is thought to be the author of the Tosanjoden-zu" which is the subject of this paper however there is evidence suggesting otherwise. This study suggests this drawing is very similar to a "Tosanjoden-no-zu" authored by Teikan Tou. Teikan and Kozen were known to have collaborated on other published works, so it is possible that Kozen transcribed Teikan's "Tosanjoden-no-zu" and included it in his "Inkyu-oyobi-shiterzu" as a "Tosanjoden-zu". Kozen collectly understood the main roof's ridge of the Higashino-tai in this Tosanjoden was in a north to south orientation.
