Select the option most resembling your bulb from the drop-down menu to proceed to the next step. Please consult "option descriptions" for detailed info.
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FULL OPTION DESCRIPTIONS / IMAGE GLOSSARY: [Option titles are also linked to proceed to the next step.]
Note: Bulb looks like the usual pear shaped household light bulb but has a V-shaped tungsten filament OR two S-shaped tungsten filaments at the tips of the two extended inner leads as well as a metallic or silver colored drop of liquid inside it.
OPTION A: Bulb has a V-shaped tungsten filament (as seen with base up). Silver colored drop of liquid will show at bottom of bulb’s bowl when bulb is held base up. key no. [590a]
OPTION B: Bulb has two S-shaped tungsten filaments mounted on the two long, thick inner leads. Silver colored drop of liquid will show at bottom of bulb’s bowl when bulb is held base up. key no. [590b]