- Lighting devices having a vessel to contain fuel used as a source of illumination, such as grease or oil. The term also refers to relatively small -- of a size to be placed on or beside a desk or table -- household or office lighting devices that incorporate a vessel of glass or some similar material that encloses the source of illumination, whether a candle, oil, gas-jet, or incandescent wire inside a light bulb. The lamp was invented at least as early as 70,000 BCE, originally consisting of a hollowed-out rock filled with moss or some other absorbent material that was soaked with animal fat and ignited. To refer to the glass bulbs used as a component of electric lamps, use "light bulbs."
- A baked or semi-fired material that is usually a mixture of clay, grog, and water; it has been used for pottery, statuettes, lamps, roof tiles, and cornices since ancient times. It may be glazed prior to firing. To produce an item, terracotta is molded or shaped, dried for several days then fired to at least 600 C. It is fireproof, lighter in weight than stone, and usually brownish red in color.
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