STEP ???: Filament Material and Configuration [Part III: Metallic Looking Filaments]
Consult the "Options Descriptions" list below then select the option most resembling your bulb from the drop-down menu.
FULL OPTION DESCRIPTIONS / IMAGE GLOSSARY:
OPTION A: [49d3] - (Figure 13a, 70f - Thumbnail) “Tipped lamp has one or more squirrel cage metallic filaments: i.e. a single metallic filament that is very long (about two to three feet in total length) and slender or finer than that of carbon filaments and is threaded or strung between two levels of numerous wire hooks or arms attached radially around the upper and lower portions of the button rod, giving a squirrel cage like look. The filament may continue onto a second or third cage. Each arm supporting the filament has an aesthetically looking curved hook at the end, giving a pleasing ornamental look to the interior of the bulb.” Go to 46 (stem seal). (Actually go to 46.4.)
OPTION B: [49d4] (Figure 71f- Thumbnail) “Tipped lamp has several separate metallic filaments (i.e. several separate hairpin loops) very finer than that of carbon filaments and are connected in series about the upper and lower portions of the button rod (by a number of supports with hooks at both top and bottom). Lower supports have dark welds (look for beads) connecting each single filament.” (Go to 46.4 - stem seal.)
OPTION C: [49d5] - (Figure 72f) – Drawn (or Ductile) Tungsten Filament Lamps) - “Tipped lamp has a single metallic filament that is very long (about two feet total length) and very finer than that of carbon filaments and threaded or strung between two levels of several supports with hooks attached radially around the upper and lower portions of the button rod. (Go to 46.4 - stem seal.)
OPTION D: [49d6] - (Figure 218 - Photo not available - Thumbnail) “Tipped lamp has short single coiled filament (see Figure 203f) about one inch long and metallic in appearance. (Note: See Figure 6 (A43) to distinguish a single-coiled filament from a double-coiled filament.) Coil is mounted horizontally in a semi-circular fashion on the two lead wires (bi-post mounting) and two or more wire supports attached to the shank, stem press, or button rod. Or coil could be mounted vertically from one longer lead-in wire to the shorter lead-in wire (A118).” (Go to 46.4 - stem seal.)