Re: Where Exactly Is The Equator

J. J. Lodder <nospam@xxxxxxxxxxxxxxxx> wrote:

"Mike Coon" <mjcoon@@connectfee.co.uk> wrote:

J. J. Lodder wrote:
It is possible to demonstrate the effect in the laboratory.
(at moderate latitudes)
It takes -a lot- of care though.

There is no way of doing it near the equator,

Jan

Do you have a reference to a report of someone doing it and of the exact
care that they took? (Not that I'll believe it even then!)

I would have to search, but I I am sure I have seen several.
What it takes is a big (several m) circular tub,
with a small hole precisely in the middle.
Draining should take several days.

Precaution: fill it rotating the wrong way and wait several days.
Find the sense of rotation as a function of the waiting time.
It will change from clockwise to counterclockwise
if you wait long enough.

Jan

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

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