Sentence:  Without a compass the table is <WSD>oriented</WSD>, when set at one end of a line previously determined, by sighting back on this line, [...]. To <WSD>orient</WSD> the table, when at a station unconnected with others, is more difficult. 
Meaning of the word marked with <WSD> tags:  To align or place (a person or object) so that his, her, or its east side, north side, etc., is positioned toward the corresponding points of the compass;  to rotate (a map attached to a plane table) until the line of direction between any two of its points is parallel to the corresponding direction in nature.