Pupil's ability to understand draw isometric lines is one of the fundamental elements for the basic geographical understanding.
For this investigation some tests were given to 235 seventh grade pupils, 218 eighth grade pupils, and 247 ninth grade pupils of urban and rural schools.
The results of our investigation offered us some interesting suggestions on how to teach geography.
(1) It is not always easy for even ninth grade pupils to understand isotherms and isohyets. It cannot say that it must be easy for pupils to understand many isometric lines, because we have already taught them how to read contour lines. Many atlases for a primary school contain climate maps which represent both isotherms and isohyets on one plate, but we doubt whether these maps are suitable for primary school pupils.
(2) The albility to draw isometric lines of lower secondary schol pupils is not so great, it may grow much greater if teachers could teach them well the way of drawing isometric lines, and it is desirable to begin with a simple model for training.
(3) Seventh grade pupils cannot read isometric lines wholly, but can only notice fragmentary parts of a map even though incompletely. Ninth grade pupils, however, can read isometric lines from a broader viewpoint.
(4) If the writers continue these investigations on and on, they might construct the programming system of teaching of distribution maps.
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