Re: Hot air rising and automobile thermometers

[Herbert H Gottlieb <herbgottlieb@JUNO.COM>]

> Suppose you have access to a machine shop and other kind
> of technical support. And that money is not a problem. You
> want to buid an AAPT apparatus competition item which
> clearly demonstrates that due to Coriolis forces wind
> velocities can be parallel, not perpendicular to the "isobaric
> lines". You start with the large rotating disk idea. Then what?
>
> Ludwik Kowalski

Hold a straight edge over the rotating disk with one end
of the straight edge touching the center of rotation and the
other end extending to the outer edge of the disk .

Making sure that the straight edge does not move, use it as a
guide to draw a radial line on the surface of the rotating disk.
If the line is drawn by moving a felt-tip pen at a constant
speed, the line on the disk will be curved.

If the disk is rotating very fast and the pen is moved very slowly
the line drawn will be very close to a line that is parallel to
the "isobarics" that "exist" along the radii of the disk.

Herb Gottlieb from New York City
(Where our Earth Science Teachers draw a chalk line on a rotating
globe of the earth from the North Pole to the equator to  demonstrate
the Coriolis effect and Ferrel's Laws of planetary wind deflections)