Re: [Phys-L] vortex ring

[John Denker <jsd@av8n.com>]

On 12/04/2014 03:41 PM, LaMontagne, Bob wrote:

> I thought the injection of dye into the water to see the vortex ring was pretty special

Constructive counter-proposal:  Make or buy a vortex cannon
   https://www.google.com/search?q=vortex+cannon

and fill it with smoke.
  https://www.google.com/search?q=vortex+cannon+smoke&tbm=isch
  https://www.google.com/search?q=vortex+cannon+smoke&tbm=vid

This strikes me as in every way easier and better than the 
so-called half-vortex in the water.