Newcomb, Simon, 1835-1909 · New York, H. Holt and company · leaf 253
213. Since there are four equal lines for each co-ordinate,we may use any one of these four in constructing the co-ordinate.Sometimes it is advantageous to choose such lines that, takingthe co-ordinates in some order, the end of each shall coincide … with the beginning of the next following, the end of the thirdbeing the point. For example, we may take, in order, X = OT;y = TQ;z = QF. 230 GEOMETRY OF THREE DIMENSIONS. The three co-ordinates will then form a series of three lines,each at a right angle with the other two. Again, each face of the…
Geometry, Analytic
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