Newcomb, Simon, 1835-1909, Holden, Edward Singleton, 1846-1914, joint author · New York, H. Holt and Company · leaf 83
ays parallel to S P, let us takethat one which, after emerging from the glass at T, moves in a lineparallel to its original direction. Continuing the process, let ussuppose isolated rays coming from all parts of a distant object sub-ject to the single condition that the course of each, after… … Fig. 23. toward a single point, P, in coming to the glass, and diverge fromanother point, P, after passing through the last lens. These pointswere termed by Gauss Hauptpunkte, or principal points. Butthey will probably be better understood if we call the first one thecentre of convergence, and the…
Astronomy
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