| 摘要 |
A measuring instrument for bay windows is primarily comprised of a left wing and a right wing, and the two wings are joined together by a rivet, and each of them can rotate around the rivet, and each has a straight topside. There are three sets of scale line respectively for the angle, the width and the interval on a surface of the two wings. In which, the interval lines is the most important, and they are a set of parallel lines parallel to the topside to indicate the interval to the topside. The two straight topsides can form an included angle by the rivet as a vertex. The two topsides and each pair of corresponding interval lines can align when the included angle is 180°, but each pair of the corresponding interval lines intersect when the included angle is less than 180°. Make width an indicating line pass through an intersection of some pair of corresponding interval lines, and it can just point out according width value. With the measuring instrument we not only can take an accurate angles of the bay windows or any corner of a room, but also we can easy get the length value (sometimes width value, such as draperies) of those straight lines parallel to the walls to form the included angle. It is very useful in the businesses of interior design and decoration.
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