This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1917 Excerpt: ...either regulus, in a conic. For the cutting plane meets either regulus in a conic (Art. 47). If the cutting plane contains a ray of either regulus, we have the following theorem: Any plane which passes through a ray of either regulus contains a ray of the other regulus and does not meet the surface outside these rays. ...

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