A filament? What kind of filament?

The filament got damaged.

Filament's still there.

- The filament is completely fried.

• Coloured filaments, visible under ultraviolet light;

See -- duct, hot melt, maskin', filament.

Look how thin that filament is there.

Tungsten filament is brittle when it's cold,

The electricity lights the filament, the filament lights up the bulb.

Perspiration passes through heat filaments and salt precipitators.