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Brown Corpus
A conic, C, being a ( 1, 1 ) curve on Q, meets the image of any line of Af, which we have already found to be a Af curve on Q, in Af points.
Hence its image, C', meets any line of Af in Af points.
Moreover, C' obviously meets any line Af in a single point.
Hence C' is a Af curve on Q.
Therefore, the congruence of its secants, that is the image of a general plane field of lines, is of order Af and class Af.
Finally, the image of a general bundle of lines is a congruence whose order is the order of the congruence of invariant lines, namely Af and whose class is the order of the image congruence of a general plane field of lines, namely Af.
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