An oil lamp is a lamp used to produce light continuously for a period of time using an oil-based fuel source. The use of oil lamps began thousands of years ago and continues to this day, although their use is less common in modern times. They work in the same way as a candle but with fuel that is liquid at room temperature, so that a container for the oil is required. A textile wick drops down into the oil, and is lit at the end, burning the oil as it is drawn up the wick.
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Most modern lamps (such as fueled lanterns) have been replaced by gas-based or petroleum-based fuels to operate when emergency non-electric light is required.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 . 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 or , 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 .
Types Lamps can be categorized based on different criteria, including material (clay, silver, bronze, gold, stone, slip), shape, structure, design, and imagery (e.g. symbolic, religious, mythological, erotic, battles, hunting).
Typologically, lamps of the Ancient Mediterranean can be divided into seven major categories:
Wheel-made This category includes Greek and Egyptian lamps that date before the 3rd century BC. They are characterized by simplicity, with little or no decoration, a wide pour-hole, a lack of handles, and a pierced or unpierced lug. Pierced lugs occurred briefly between the 4th and 3rd century BC. Unpierced lugs continued until the 1st century BC.
Volute, Early Imperial With spiral, scroll-like ornaments called volutes extending from their nozzles, these lamps were predominantly produced in Italy during the Early Roman period. They have a wide discus, a narrow shoulder, no handle, elaborate imagery and artistic finishing, and a wide range of patterns of decoration.
High Imperial These lamps are late Roman. The shoulder is wider and the discus is smaller with fewer decorations. These lamps have handles, short, plain nozzles, and less artistic finishing.
Frog This is a regional style lamp exclusively produced in Egypt and found in the regions around it, between and 300 AD. The frog (Heqet) is an Egyptian fertility symbol.
African Red Slip Lamps made in North Africa, but widely exported, decorated in a red slip. They date from the 2nd to the 7th century AD and comprise a wide variety of shapes including a flat, heavily decorated shoulder with a small and relatively shallow discus. Their decoration is either non-religious, Christian or Jewish. Grooves run from the nozzle back to the pouring hole. It is hypothesized that this is to take back spilled oil. These lamps often have more than one pour-hole.
Slipper These lamps are oval-shaped and found mainly in the Levant. They were produced between the 3rd to 9th centuries AD. Decorations include vine scrolls, palm wreaths, and Greek letters.
Factory lamps Also called , these are universal in distribution and simple in appearance. They have a channeled nozzle, plain discus, and two or three bumps on the shoulder. Initially made in factories in Northern Italy and Southern Gaul between the 1st and 3rd centuries AD, they were exported to all Roman provinces. The vast majority were stamped on the bottom to identify the manufacturer.
In religious contexts
Judaism
Lamps appear in the Torah and other Jewish sources as a symbol of "lighting" the way for the righteous, the wise, and for love and other positive values. While fire was often described as being destructive, light was given a positive spiritual meaning. The oil lamp and its light were important household items, and this may explain their symbolism. Oil lamps were used for many spiritual rituals. The oil lamp and its light also became important ritualistic articles with the further development of Jewish culture and religion. The Temple Menorah, a ritual seven-branched oil lamp used in the Second Temple, forms the centre of the Chanukah story.
Christianity
There are several references to oil lamps in the New Testament. In the Eastern Orthodox Church, Roman Catholic Church, and Eastern Catholic Churches oil lamps (, ) are still used both on the Holy Table (altar) and to illuminate icons on the iconostasis and around the temple (church building). Orthodox Christians will also use oil lamps in their homes to illuminate their icon corner. Traditionally, the sanctuary lamp in an Orthodox church is an oil lamp. It is lit by the bishop when the church is consecrated, and ideally it should burn perpetually thereafter. The oil burned in all of these lamps is traditionally olive oil. Oil lamps are also referenced as a symbol throughout the New Testament, including in the Parable of the Ten Virgins.
Islam
The Quran mentions "lanterns" (or lamps) in two key verses: Surah An-Nur (24:35), the famous "Verse of Light," which uses the parable of a lamp in a niche to describe Allah's divine light, and Surah Al-Mulk (67:5), which describes stars in the lower heaven as lamps (masabih) used as missiles against devils, as cited in these Quran.com and Quran.com results.
Hinduism
Oil lamps are commonly used in Hindu temples as well as in home shrines. Generally the lamps used in temples are circular with places for five wicks. They are made of metal and either suspended on a chain or screwed onto a pedestal. There will usually be at least one lamp in each shrine, and the main shrine may contain several. Usually only one wick is lit, with all five burning only on festive occasions. The oil lamp is used in the Hindu ritual of Aarti.
In the home shrine, the style of lamp is usually different, containing only one wick. There is usually a piece of metal that forms the back of the lamp, which has a picture of a Hindu deity embossed on it. In many houses, the lamp burns all day, but in other homes, it is lit at sundown. The lamp in the home shrine is supposed to be lit before any other lights are turned on at night to attract prosperity and divine blessings.
A hand-held oil lamp or incense sticks (lit from the lamp) are also used during the Hindu puja ceremony. In the North of India, a five-wick lamp is used, usually fueled with ghee. On special occasions, various other lamps may be used for puja, the most elaborate having several tiers of wicks.
In South India, there are a few types of oil lamps that are common in temples and traditional rituals. Some of the smaller ones are used for offerings as well to bring stability, abundance, and good health to the family.
A brass lamp with a depiction of goddess Sri Lakshmi over the back piece. They are usually small and have only one wick. Nilavilakku A tall brass or bronze lamp on a stand where the wicks are placed at a certain height. A brass or bronze lamp in the form of a lady holding a vessel with her hands. This type of lamp comes in different sizes, from very small to almost life-size. There are also large stone versions of this lamp in Hindu temples and shrines of Karnataka, Tamil Nadu and Kerala, especially at the base of columns and flanking the entrance of temples. They have only one wick. A brass or bronze lamp hanging from a chain, often with multiple wicks. Nachiarkoil lamp An ornamental brass lamp made of series of diyas, a handicraft product which is exclusively made by the Pather (Kammalar) community in Nachiyar Koil, Tamil Nadu, India.
When the Big Temple in Thanjavur, Tamil Nadu, was built 1010 AD, there were elaborate measures taken to provide lighting for the temple. Lands were donated to or conquered for the temple for this sole objective. The income from these lands would go towards providing the oil for the lights.
Chinese
Oil lamps are lit at traditional Chinese shrines before either an image of a deity or a plaque with Classical Chinese characters giving the name of the deity. Such lamps are usually made from clear glass (giving them a similar appearance to normal drinking glasses) and are filled with oil, sometimes with water underneath. A cork or plastic floater containing a wick is placed on top of the oil with the bottom of the wick submerged in the oil.
Such lamps are kept burning in shrines, whether private or public, and incense sticks or joss sticks are lit from the lamp.
History
Curved stone lamps were found in places dated to the 10th millennium BC (Mesolithic, Middle Stone Age Period, c. 10,300–8000 BC). The oldest stone-oil lamp was found in Lascaux in 1940 in a cave that was inhabited 10,000 to 15,000 years ago.
Some archaeologists claim that the first shell-lamps existed more than 6,000 years ago (Neolithic, Later Stone Age, c. 8500–4500 BC). They believe that the alabaster shell-shaped lamps dug up in Sumerian sites dating to 2600 BC were imitations of real shell-lamps that had been used for a long time (Early Bronze Age, Canaanite/Bronze I–IV, c. 3300–2000 BC).
It is generally agreed that the evolution of handmade lamps moved from bowl-shaped to saucer-shaped, then from saucer with a nozzle, to a closed bowl with a spout.
Chalcolithic Age (4500–3300 BC) The first manufactured red pottery oil lamps appeared in the Chalcolithic. These were of the round bowl type.
Bronze Age (3200–1200 BC) Bronze Age lamps were simple wheel-made bowls with a slight pinch on four sides for the wick. Later lamps had only one pinch. These lamps vary in the shape of the rim, the general shape of the bowl and the shape of the base.
Intermediate Bronze Age (EBIV/MBI)