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Mr. Huxtable,

The gravitational anomaly caused by the lead sea-mount may cause the
sea-level to be higher if the volume of water attracted toward the sea-mount
collects in such a way around the sea-mount that it causes a "mound" of
water that is "higher" than the total depression of the water surface over
the sea-mount.  However, it seems to be asking a lot of gravity, even from a
lead sea-mount, to create a "mound" of water.  The rapid decrease in
gravitational attraction (inversely proportional to the square of the
distance) and the insignificant difference between the vector sum of the
attraction towards the sea-mount and the earth and the vector of attraction
towards the center of the earth would both seem to make mound building
difficult.

Therefore, I think your original statement was correct, even for a
sea-mount.

George Istok

-----Original Message-----
From: Navigation Mailing List [mailto:NAVIGATION-L@LISTSERV.WEBKAHUNA.COM]
On Behalf Of George Huxtable
Sent: Friday, August 15, 2003 11:05 AM
To: NAVIGATION-L@LISTSERV.WEBKAHUNA.COM
Subject: Re: Navigating Around Hills and Dips in the Ocean

In an earlier mailing today, replying to Sharon Casey, I said-

>Above an underwater sea-mount made of lead, there would be an increase in
>gravity, and >the sea-level would be a bit lower there than it would be if
>the lump of lead was absent.

Thinking about it a bit harder, and perhaps a bit more clearly, it now
seems to me that I got the last bit quite wrong and should really have
said-

"Above an underwater sea-mount made of lead, there would be an increase in
gravity, and the sea-level would be a bit higher there than it would be if
the lump of lead was absent."

That error doesn't affect anything else in the argument, but it's better to
get these things right rather than wrong.

George.

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