| 摘要 |
<p>A level comprises at least one rounded tube filled with a liquid and with a floating ampoule. More than 90 degrees of the tube are exposed in one or more directions, on the tube there is a scale with are relevant signs and/or marks and/or numbers for measuring the angle of the surface on which the level is placed. The scale is two-sided and there are also relevant signs and/or marks and/or numbers at the top of the scale, for measuring the surface by looking at the tube and the scale from any one of several directions. The level includes means for concurrently measuring the angle in two planes, using a rounded sphere filled with a liquid with an air bubble floating within.</p> |
