Newcomb, Simon, 1835-1909 · New York, H. Holt and company · leaf 253
OT = WQ; y=: SP = VP= 0W= TQ; z = QP = TS = OV = WR. We shall then have, by considering the three planes which contain these co-ordinates. Plane EPS || plane XY;Plane SPQ \\ plane YZ;Plane QPR \\ plane ZX. Hence the three planes which contain the co-ordinates,together with those which contain the… … 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
Geometry, Analytic
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