The Rev. D. W. G. Gwynne, M.D., was a physician in holy orders. In 1853 he lived at P--- House, near Taunton, where both he and his wife "were made uncomfortable by auditory experiences to which they could find no clue," or, in common English,... Read more of "put Out The Light!" at Scary Stories.ca

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Focal Points

The focal point of a circle is its center, and is called the focus. But an ellipse has two focal points, called foci, represented by F, F in Fig. 148, and by B, B in Fig. 149.
A produced line is one which extends out beyond the marking point. Thus in Fig. 148 that part of the line K between F and G represents the produced portion of line K.

Fig. 149.

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