Potential and Thermionic Emissio~. 557 with its necessary (automatic) appearance in (up1 , ~pl~) ; it is one main connecting link between the original vectors and th~)se obtained by inversion (crossed pairing).The pert)endicularity of (M, s), requiring equal orthogonal projections llpon the line el (s) for the vectors (Q:, Q.S/), considez-ed by itself demands no more tha~l equality of scale-factors api~lied to the same segment of that line.The consideration that here precedes makes the selection (ns) natural.The material of this particutar discussion traverses thmiliar ground, so far as the final facts about conjugate vectors are concerned.But the line of attack there formulated is capable of deducing novel results elsewhere.
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Richardson et al. (1922) studied this question.