# Errata

**Author(s):** Anonymous  
**Year:** 1720  
**Journal:** Philosophical Transactions (1683-1775)  
**Volume:** 31  
**Pages:** 2 pages  
**Identifier:** jstor-103414  
**JSTOR URL:** <https://www.jstor.org/stable/103414>  

---

constructionem) est ergo \( K_e \) æqualis \( KA \); unde est punctum \( K \) ad parabolam foco \( A \) & vertice principali \( C \) descriptam. \( Q.E.D. \)

Bifecto autem angulo \( AKE \) à rectâ \( KB \), tanget hæc utramq; parabolam, tam foco \( F \) per \( A \) & \( K \), quam foco \( A \) per \( K \) descriptam. Unde se mutuo tangunt parabolæ. \( Q.E.D. \)

Errat. Pag. 152. l. ult. pro \( \beta c. \) l. \( B b. \)

FINIS.

LONDON:
Printed for W. and J. Innys. Printers to the Royall Society; at the Sign of the Prince's Arms, End of St. Paul's-Church-Tard.