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The Mullard 1909H is a barretter or current stabiliser. So far no operating details have been located.
The iron wire is a plain single strand that is fixed into folds in the supports and supported on hooks around the central glass rod.
The balloon envelope is 50 mm in diameter, and excluding the B4 base pins is 97 mm tall.
Reference: Observation.


Updated June 30, 2017.
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