ID: 
2061
Maker's Name: 
General Electric
Where made: 
USA
Dimensions: 
6.2 × 6.2 × 12.3 cm

Carbon filaments are relatively fragile with a shorter life than Tungsten filaments.

The carbon filament here is a double loop with as large radius of curvature as possible. This reduces any torsional tension created in manufacture.

The filament is supported at either end and in the middle only, so extra stresses are not introduced by support structure.