The use of multiplied pressures for automatic altitude adjustments Page: 3 of 10
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uninfluenced by temperature, these devices are usually arranged
so that the adjustment effected by a change in pressure compen-
sates also for the change in temperature by which it is normally
accompanied. Hence the inability of these devices to alter an
adjustment solely because of a change in temperature is of minor
importanoe except in rare instances where the temperature is far
removed from its normal value, Nearly all of these automatic
,ntrols are essentially the same in principle. Their chief ele-
..ant is a tight chamber containing a gas (usually air). When the
-Atmospheri-e,, pressure changes, the resultant change in the differ-
ence between it and the pressure of the gas "ithin the chamber
causes motion of some wall of the chamber., This motion effects
the desired adjustment.
In such devices a leak in the supposedly tight chamber means
utter failure. The elimination of this source of danger is one
of the aims of the method of altitude compensation about to be
described. To this end the most important step is a change in
the method of operating-the automatic device0 The change suggest-
ed is to make the source of operation the difference between at-
mospheric pressure and some multiple of atmospheric pressure
instead of the difference between atmospheric pressure and.that
f a gas confined in a tight chamber. Following are tabulated
.lues of the difference between atmospheric pressure and twice
a-d ten times atmospheric pressure respectively.
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Sparrow, Stanwood S. The use of multiplied pressures for automatic altitude adjustments, report, January 1, 1922; (digital.library.unt.edu/ark:/67531/metadc53798/m1/3/: accessed May 27, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.