| 摘要 |
A device comprising a level line detector selectively oriented in reference to a surface; a moveable arm; and a processor in communication with the detector and arm to selectively move the arm, to maintain the arm in surface reference. In another embodiment, a system comprising a level line detector selectively oriented in reference to a surface; a moveable arm; a processor in communication with the detector and arm to selectively move the arm, to maintain the arm in surface reference; and a level line to communicate with the detector. In another embodiment, a method comprising: selectively orienting a level line detector in reference to a surface; detecting a level line; communicating detection data to a moveable arm; and moving the arm based on the data, to maintain surface reference.
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