"Don Pearce" wrote in message

On Mon, 9 Aug 2004 13:21:05 -0400, "Arny Krueger"
wrote:

As I pointed out, the ideal piston has no radial radiation.

No - an ideal piston is one which moves as a single piece, and
possesses a full set of diffraction according to its geometry. That
will include radial radiation.

The ideal piston will have a polar response with a dispersion
inversely related to frequency.

A piston with no radial radiation would be completely unlike an ideal
piston.

We obviously have different ideals.

;-)