Popular astronomy : a concise elementary treatise on the sun, planets, satellites and comets (1865)
Mitchel, O. M. (Ormsby MacKnight), 1809-1862 · New York : Oakley & Mason · leaf 303
ipse, and after careful examinationproved to be the general expression, embracing within itsgrasp no less than four curves, the circle, the ellipse, theparabola^ and the hypci^bola. These curves are allied in 284 THE COMETS. a most remarkable manner, having certain properties incommon, and having… … L the circular base of a cone seen obliquely. Any planepassed parallel to the base, or perpendicular to the axisA B, will cut from the surface a circle, as F E Gr. Aplane passed obliquely to the axis will cut from the sur-face an ellipse, as M 0 0. Any plane passed parallelto the side of the cone A…
Astronomy
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