Bunch Filament (G.B.)

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A filament (usually of multi-vee formation) in the form of a segment of a hollow truncated cone or hollow cylinder, generated around the axis of the lamp and embracing an arc of a circle greater than 180 degrees but not fully closed.

Ch2 Fig31.jpg

Note: For the French and German terms applicable, see 2-3-210 and 2-3-215.

Please note that this is the term as it stands in the original IALA Dictionary edition (1970-1989)