On Mon, 21 Mar 2005 19:19:19 GMT, Nigel M wrote:
http://mathworld.wolfram.com/Parabola.html

Hi Nigel,

As you may observe, their description exactly matches my instructions.
All Parabolas look the same, it is merely a difference in constants,
and the constants in this regard are explicitly stated as the variable
"a."

Change "a" and hold "L" constant, and you have identical gain in the
direction of interest (perpendicular to the directrix).

The only question left unresolved is do you choose graph paper from an
8x11 tablet, or from a newssheet sized tablet? Same instructions for
either, the sheet from the larger tablet (larger "L") yields higher
gain in the direction of interest (perpendicular to the directrix).
Choose any "a" dimension you care to for aesthetics sake only.

73's
Richard Clark, KB7QHC