Constructive work; . ^ ;—^—\ \ \ \. FIGURE XIII. Figure XIII. shows what may be done in the primarygrades by way of measuring the slant of the suns rays atdififerent seasons of the year. The httle piece of apparatus is made of two pieces ofwood—one I2x3x>4, the other 4x3x>^. A small brace is required to keep the upright piece firm. At 12 oclock noon the shadow stick is placed on a levelsurface, the upright end pointing directly south. If the suns rays were vertical the upright piece wouldcast no shadow. But since the rays do not come to usvertically a shadow is cast. This shadow increase
Constructive work; . ^ ;—^—\ \ \ \. FIGURE XIII. Figure XIII. shows what may be done in the primarygrades by way of measuring the slant of the suns rays atdififerent seasons of the year. The httle piece of apparatus is made of two pieces ofwood—one I2x3x>4, the other 4x3x>^. A small brace is required to keep the upright piece firm. At 12 oclock noon the shadow stick is placed on a levelsurface, the upright end pointing directly south. If the suns rays were vertical the upright piece wouldcast no shadow. But since the rays do not come to usvertically a shadow is cast. This shadow increases in length according to the slantof the suns rays. Therefore we have the longest shadowin December. Figure XIII. represents a stick that has been markedfrom June to December. The same stick will be used fromDecember to June. This will give the shortening of theshadow.
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Keywords: ., bookcentury1900, bookdecade1900, booki, booksubjectmanualtraining
