| 摘要 |
<p>PURPOSE:To enable to read the locus of reflected sun very fast and continuously, by forming a protractor, reflected solar locus chart and eye sight chart with transparent films and overlapping the centers freely rotatably. CONSTITUTION:A protractor 1 measuring an angle between a front glass for a car and the like and the north-south axis N, reflected solar locus chart 2 replacing the time of solar locus from the morning to the afternoon, and eye sight chart 3 drawing the eye sight between eye angles of a front glass viewed by the driver toward the progressing direction (a) of a car or the like, e.g., in the range of 20 deg., are prepared. They are constituted with transparent films. First, a point P is determined, an axis N, reflected glass plane M and the direction (a) are matched so that they pass through the point P. Next, 0 deg. of the protractor 1 is coincident with the plane M to read an angle A deg. with the axis N. Further, the axis N of the locus chart 2 is turned to an opposite direction from the actual axis N by the angle A deg. for the plane M. Thus, the locus of reflected sun projected on the plane M can be obtained. Next, the chart 3 is turned so that the direction (a) of the chart 3 is coincident with the direction of a road.</p> |
