In ancient times, such human activities as transportation, hunting, fishing, and building are considered to be constructive techniques mankind mastered.
Developing these constructive techniques, mankind has rapidly improved its civilization comparing with other animals.
Among these works, building of huts is the one which needs higher technique than others.
In building huts, the following three elements are necessary; those are framework, roofing, and plastering. But the main element which determines the way in which the building of huts is done is the "framework ".
From the viewpoint of their shape, we can classify the types of huts as follows, (1) cone type, (2) semi-spherical type, (3) tunnel type, (4) square type, (5) chevron type, (6) hip type, (7) flat roof type, (8) slope roof type and (9) gable type.
In classifying the types of huts, we must also consider the types of the main pole, the total number of posts, the total number of poles, and also the total num- ber of parts at which knots are held.
In this paper, the author describes on how to make the frame-work for poles, and also on the kinds of knotting suitable for each step in but building.
In the last part of this paper the author discussed each examples of the types of but found among present uncivilized peoples.
Using these results, the author hopes to clarify the history in the development of building technique in near future.
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