| 11. | One was a processed bamboo fiber used for a filament inside a glass bulb containing a vacuum.
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| 12. | Over it curves the glass bulb, which condenses the mercury that is evaporated as the device operates.
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| 13. | Thus the glass bulbs are created.
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| 14. | Francis Hauksbee developed a more advanced electrostatic generator around 1704 using a glass bulb that had a vacuum.
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| 15. | The Gem was the company's first dimmable glass bulb and remains their best selling light bulb to date.
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| 16. | It consists of a large weighted glass bulb with a thin stem rising from the top with calibrated markings.
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| 17. | Unlike glass bulbs, LED's are hard to break and will glow continuously for more than 11 years before failing.
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| 18. | The starter is a small metal canister with an inert gas and two bimetallic contacts enclosed in a glass bulb.
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| 19. | The arc discharge is generally confined to a small fused quartz arc tube mounted within a larger borosilicate glass bulb.
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| 20. | LED lights, which are encased in solid plastic rather than a hollow glass bulb, may be molded into any shape.
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