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Re: An He177 equipment part to identify, please
It is a scale of barometric pressure adjustment, which was part of any altimeter. When adjusted to the local pressure at the airfield the altimeter will show altitude from the airfield level. When adjusted to 1013,25 mb the altimeter will show so called standard altitude, which is used for separating higher flying aircraft safely from each others (every aircraft uses altitude indication based on the same reference level).
Same procedure is used still today with all aircraft flying in controlled airspace.
Matti
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