John
It seems we are in agreement then. ;-). It's a good system that is not
designed for use in conditions of abnormal gravity when its usefulness
has to be supplemented.
Chris
On 20 Nov 2004, at 21:25, John A. Lind wrote:
>
> You are quite correct that it is a form of tri-axial accelerometer and
> therefore cannot sense anything unless there is an acceleration.
> Gravity
> is a constant force; i.e. it induces constant accleration in the
> absence of
> another equal, counteractive force. In the _changing_ motion that most
> people experience simply moving about self-propelled on the Earth's
> surface, which requires acceleration to produce it, the inner ear
> accelerometer (as with all accelerometers) senses the vector sum of
> all the
> forces when they do not add to zero. Moving about while making the
> photograph gives a sense of "up" and "down" . . . and therefore
> "horizontal" as orthogonal to that. You are correct that it (the
> cochlea)
> is not, and cannot be used alone; its data must be compared to and
> integrated with that from other senses.
>
> There is also data from musculo-skeletal system you mention . . .
snip
> BTW, gravitational mass is equivalent to inertial mass, and therefore
> gravitational and inertial forces and accelerations are equivalent.
> This
> is the principle postulate of General Relativity (as an extension of
> Special Relativity).
>
> -- John Lind
<|_:-)_|>
C M I Barker
Cambridgeshire, Great Britain.
+44 (0)7092 251126
http://www.threeshoes.co.uk
http://homepage.mac.com/zuiko
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