| 摘要 |
An angle measurement tool includes a frame supporting a rectangular plate upon which a calculator is positioned. The frame further supports a pivotal sine bar having a bubble assembly supported thereon. The angle measurement tool provides angle measurement and setting by positioning the lower edge of the plate upon the surface of interest and pivoting the sine bar until the bubble assembly indicates a horizontal attitude of the sine bar. The calculator is a dedicated calculator providing basic functions of finding an angle given its opposite side measurement or finding an opposite side given the angle. In an alternate embodiment, a plate defines a reference edge and a plurality of angles and receives a removable bubble assembly which is utilized for measuring standard angles.
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