Re: Where Exactly Is The Equator

+ nospam@xxxxxxxxxxxxxxxx (J. J. Lodder):

| Addition: Googling on "Rossby number" (+ bathtub)
| will get you what you want to know.

Or starting at the Wikipedia article

http://en.wikipedia.org/wiki/Coriolis_effect

one finds a link to Fluid Mechanics films (from 1961):

http://web.mit.edu/fluids/www/Shapiro/ncfmf.html

I particular, the movie "Vorticity, Part 1" at

http://modular.mit.edu:8080/ramgen/ifluids/Vorticity_Part_1.rm

(RealPlayer required) shows the bathtub experiment, starting about 20
minutes in. The tub in question is quite cylindrical, with a small
hole in the center and a plug in the hole that can be removed from the
outside (so you don't disturb the water). They fill the tub, let it
sit for a day, pull the plug, and in the last minutes of the tub
draining (which takes about 15 minutes - thankfully they don't show it
all) one can see a definite counterclockwise rotation.

--
* Harald Hanche-Olsen <URL:http://www.math.ntnu.no/~hanche/>
- It is undesirable to believe a proposition
when there is no ground whatsoever for supposing it is true.
-- Bertrand Russell
.

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