Re: Unusual light bulbs
I think that the twin filament MES bulb might have been intended for use in lit navigation buoys for harbour entrances etc.
Use of two bulbs would be less satisfactory as they cant both be accurately focused. A more sophisticated arrangement was several bulbs mounted in a rotating holder, when a bulb failed the holder rotated the next one into place.
Made in sizes from less than 1 watt in E10 up to hundreds of watts in GES.
These lights used very large capacity disposable batteries, sometimes of more than 1,000 AH. Longer running than the 8 day oil lamps otherwise used, and simpler and safer than acetylene.
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