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Voltage- 110-120v Wattage/rating- ? Filament- Carbon, 3-loop "transverse oval" Cap type- Brass Thomson Houston (pressed type) Circa- just before 1900 Finish- Clear glass Origin- USA This is a wonderful example of a Shelby lamp. The squashed mushroom-shaped glass envelope is a distinctive characteristic of lamps produced by the Shelby company. It has similarly unique filament shape. Known as (I believe) "transverse oval", it has flat horizontal oval-shaped loops instead of the more elongated vertical shape. The reason- simple. To produce a more even light than that produced by hairpin or double-loop types, and especially to increase the portion of light that shines downward. I have a little more info about these lamps, and the Shelby company somewhere, I`ll post it all when I find it. It is fitted with a brass bodied Thomson Houston base and probably dates from just before 1900, it wouldn`t have been much earlier as the base insulation is porcelain.   |
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