| 摘要 |
<p>The device (10) has a telescopic mast (11) possessing graduations corresponding to a distance between ends (11a, 11b). A strip (15) has an end connected to the mast by a joint that is placed nearer to the end (11a) of the mast. The strip has graduations whose origin coincides with the end (11a) of the mast. A closed loop shaped belt (16) with adjustable perimeter, is slidably mounted along a direction in a guiding element (17) that is slidably mounted along another direction of the strip, and has graduations which correspond to its perimeter.</p> |
