Art Carlson wrote: > Is there any way to construct a hyperbola which is of >similar elegance and practicality to the methods for ellipses? Is >there an easy way, given a hyperbola, to find its axes, asymptotes, or >foci?
Hello Art, Do you have the geometrical construction using an axis, a perpendicular DIRECTRIX and a focus? You'll probably find it in any oldish book on Engineering Drawing e.g. "Practical Geometry & Engineering Graphics" by W. Abbott Pub Blackie If you're relly stuck I'll send you a GIF of the construction involved. Tony Moss ========================================================== \ ** ******* \\ ** ** \\ ** ******* *\\ ** ** *\\ ******* ******* **\\ ***\\ Tony Moss, Lindisfarne Sundials *****\\ 43, Windsor Gardens, Bedlington, *******\\ Northumberland, England, NE22 5SY, **********\\ 55° 07' 45" N 1° 35' 38" W Tel/FAX +1670 823232 ========================================================== Horizontal, Vertical, Declining, Analemmatic & Capuchin Sundials individually made in solid engraving brass. Professional-quality Dialling Scales, 'engine-divided' meridian layout instrument with software. Analemmatic dial plots - any size for any latitude. ==========================================================