| 摘要 |
<p>A mechanical device (50) for surveying an area (2) and for subsequently replicating the surveyed area (2) comprises a base structure (53) and means (54) for taking a plurality of polar co-ordinate measurements relative to a central datum point (59) on the base structure (53). The base structure (53) is mounted on friction pads (56) so as not to be easily displaced from a surface to which the device is applied. The means (54) comprise counters (125 and 135) which display angular and distance measurements respectively. The counters are driven by relative rotation between the base structure (53) and structure (57 or 58) superimposed thereon.</p> |
