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Oil lamp

Lamp used for lighting by burning oil

  • 16 min read
  • 5 chapters
Group of ancient Hellenistic and Roman lamps.
Combirom2 · CC BY-SA 4.0

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Oil lamps are a form of lighting, and were used as an alternative to candles before the use of electric lights. Starting in 1780, the Argand lamp quickly replaced other oil lamps still in their basic ancient form. These in turn were replaced by the kerosene lamp in about 1850. In small towns and rural areas the latter continued in use well into the 20th century, until such areas were finally electrified and light bulbs could be used.

Sources of fuel for oil lamps include a wide variety of plants such as nuts (walnuts, almonds and kukui), seeds (sesame, castor, or flax) and fruit (olive). Also widely used were animal fats (butter, ghee, fish oil, shark liver, whale oil, or seal oil). Camphine, made of purified spirits of turpentine, and burning fluid, a mixture of turpentine and alcohol, were sold as lamp fuels starting in the 1830s as the whale oil industry declined. Sales of both camphene and burning fluid decreased in the late 1800s as other sources of lighting, such as kerosene made from petroleum, gas lighting and electric lighting, began to predominate.

Most modern lamps (such as fueled lanterns) have been replaced by gas-based or petroleum-based fuels to operate when emergency non-electric light is required. Oil lamps are currently used primarily for their ambience.

Components

The following are the main external parts of a terra-cotta lamp:

Shoulder
Pouring hole
The hole through which fuel is put inside the fuel chamber. The width generally ranges from 0.5–5 cm (0.2–2.0 in). There may be one hole or multiple holes.
Wick hole and the nozzle
May be either an opening in the body of the lamp or an elongated nozzle. In some specific types of lamps, there is a groove on the top of the nozzle that runs along to the pouring hole to re-collect the oozing oil from the wick.
Handle
Lamps can come with a handle. The handle can come in different shapes. The most common is a ring-shaped for the forefinger surmounted by a palmette, on which the thumb is pressed to stabilize the lamp. Other handles can be crescent-shaped, triangular, or oval-shaped. The handleless lamps usually have an elongated nozzle, and sometimes have a lug rising diagonally from the periphery. The lug may act as a small handle where the thumb rests. Some lugs are pierced. It was speculated that pierced lugs were used to place a pen or straw, called the Latin: acus or festuca, with which the wick was trimmed. Others think that the pierced lugs were used to hang the lamp on a metal hook when not in use.
Discus
Fuel chamber
The fuel reservoir. The mean volume in a typical terra-cotta lamp is 20 cc (20 mL).

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