Altimeter Calibration Height

"Matt Whiting" wrote in message
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Steven P. McNicoll wrote:
"Matt Whiting" wrote in message
...
Yes, great idea.


I thought so.


Take an altimeter and set it on a table. Don't move it!

Turn the knob that adjusts the pressure scale to one extreme. Record
the
indication on the face of the altimeter. Now turn the knob to the other
extreme of travel. Record the indication on the face of the instrument.
Now the big question: which value recorded is the altitude at the level
of
the instrument?


One step at a time. Let's see where you are in your understanding of
altimetry before we move on. Answer the questions I posed to Neil Gould.

Yes, one step at a time. Tell me how an instrument that indicates its own
altitude can indicate two vastly different values without changing its
altitude? It is a very simple question.

Which altitude changed? Indicated altitude? Pressure altitude? Density
altitude? True altitude? (Does one presumes WGS84 when speaking of true
altitude?)