The maximum section column of townhouses in Takayama can be classified into Type A [earthen floor type] and Type B [living space type]. The dimensions of maximum section columns tended to increase as the plane scale increased and frontage became wider. The atrium area tended to expand in the early Meiji period. We observed that the form of a maximum section column standing one straight line at rectangle atrium become the form of a maximum section column standing crossing-axis in plane of structure of ridge direction and span at irregularly shaped atrium, together complication of plane and atrium shape.
