| 摘要 |
<p>The device (8) has reference elements (18) arranged in different distances to longitudinal lines (20) and/or breadth lines (22) on an outer surface of a carrier (10). Each reference element has an inner surface with circular cylinder shape, where the inner surface has polygonal shape in cross-section. The carrier is formed as a rectangular plate or cube, and is made of stone i.e. granite. The reference elements are made of metal e.g. titanium and titanium alloy, and are formed as casing, ball, cube or hemisphere.</p> |
