Cylindrical Filament

2-3-210

A filament (usually of multi-vee formation) in the form of a hollow circular cylinder generated around the axis of the lamp.

Note: The filament may be fully closed in plan, or may embrace an arc of less than 360 degrees.

The English term "Cylindrical filament" is usually limited to the case of a closed cylinder.

Otherwise, the English term used is "Bunch filament" (2-3-220).

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

English