| 摘要 |
An angle meter is designed to measure the angle of a plane or the angles of cubic objects and structural members with high precision. In the meter, both inner and outer sides(1, 1', 2, 2') and center lines(3, 3') make the tips of upper and lower planes(4, 4') a semicircle, the whole structure being riveted on the center of the tip circle. The angle meter comprises a visually graduated board(8) and three hands(10, 10', 10'') of different length to indicate the measured angle on the tip of the lower plane(4').
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