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[OM] Re: Level photography ;-), was [photo] Fall Mist

Subject: [OM] Re: Level photography ;-), was [photo] Fall Mist
From: Chris Barker <ftog@xxxxxxxxxxxxxxxx>
Date: Sat, 20 Nov 2004 22:58:17 +0000
Very interesting; I suppose labyrinthitis has some connection with this  
condition.  But of course, some people experience something similar  
because of contamination with alcohol.  And alcohol persists for  
several hours it seems and accounts for poor stability after  a heavy  
drinking session ;-)

Going really OT now:  pilots can suffer serious spatial disorientation  
when flying in poor visibility and one of the reasons can be  
"sub-threshold stimulation" of the semi-circular canals.  For instance,  
a pilot might roll an aircraft very gently by mistake, and the inner  
ear does not register the movement.  But when he notices the error in  
his aircraft's attitude (say he has 20 deg of bank instead of being  
wings level) and rolls quickly back to wings level, that movement  
registers and his inner ear tells him that he is now banked in the  
opposite direction when in fact he is wings level.  This is called "the  
leans" and is insidious and rather nasty sometimes.  The remedy is to  
check your instruments and not to believe your balance mechanism.

Chris

On 20 Nov 2004, at 18:58, Piers Hemy wrote:

> That sounds righ to me Chris.  I can add that the (in terms which I  
> hope are
> appropriate) semi-circular canals' rate-of-turn and rate-of-climb  
> sensors
> are integrated with the auto-pilot, and issue commands to the control
> surfaces.  And if one or more of the canals are contaminated with solid
> matter canaliths), the measured flows in the liquid will be many times
> greater than normal, leading to commensurately great adjustments to the
> controls.  In the experience one such sufferer, turning the head in a
> particular direction while standing was interpreted as a fall to the  
> left,
> causing an immediate relaxation of the right leg muscles, and a pretty
> sudden fall to the right.  An 'interesting' experience. As was the cure
> http://www.betterhealth.vic.gov.au/bhcv2/bhcarticles.nsf/pages/ 
> Vertigo_benig
> n_paroxysmal_positional_vertigo?OpenDocument
>
> --
> Piers
>
<|_:-)_|>
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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