A thurible is a metal censer suspended from chains, in which incense is burned during worship services. It is used in the Roman Catholic, Anglo Catholic, Eastern Orthodox, Oriental Orthodox, Armenian Apostolic, some Lutheran, Old Catholic, and in various Gnostic Churches. It is also used in Co-Freemasonry and in the practice of ceremonial magic. In Catholic, Lutheran, and Anglican churches, the altar server who carries the thurible is called the thurifer.
The workings of a thurible are quite simple. Burning charcoal is inside the metal censer. Incense, sometimes of many different varieties, is placed upon the charcoal. This may be done several times during the service as the incense burns quite quickly. Once the incense has been placed on the charcoal the thurible is then closed and used for censing.
The word "thurible" comes from the Old French thurible, which in turn is derived from the Latin term thuribulum. The Latin thuribulum is further formed from the root thus, meaning incense. Thus is an alteration of the Greek word θύος (thuos), which is derived from θύειν (thuein) "to sacrifice".
Roman Rite 
Ordinary Form of the Mass 
The Roman Missal promulgated in 1969 allows the use of incense at any Mass: in the entrance procession; at the beginning of Mass to incense the cross and the altar; at the Gospel procession and proclamation; after the bread and the chalice have been placed upon the altar, to incense the offerings, the cross, and the altar, as well as the priest and the people; at the elevation of the host and the chalice after the consecration.
The number of swings of the thurible to be used when incensing persons or objects is specified in the General Instruction of the Roman Missal:
- Three double swings: the Most Blessed Sacrament, a relic of the Holy Cross and images of the Lord exposed for public veneration, the offerings for the sacrifice of the Mass, the altar cross, the Book of the Gospels, the Paschal Candle, the priest, and the people.
- Two double swings (and only at the beginning of the celebration, after the incensing of the altar): relics and images of the Saints exposed for public veneration.
- A series of single swings: the altar.
- The priest may incense the offerings for Mass by tracing a cross over them with the thurible instead of using three swings of the thurible, or he even may do both, one after the other.
The responsibilities of a thurifer include:
- Holding the thurible open to enable the priest to put incense in it, after which he blesses it with the sign of the cross without using any formula of words.
- Carrying the thurible in procession (gently swinging if needed to keep the charcoal burning).
- Presenting the thurible to the priest or deacon when they need to use it
- Incensing (in the absence of a deacon) the priest after the priest has incensed the offering at Mass.
Another server, previously called a boat boy and now more commonly a boat bearer, may carry a boat or container of incense to add as the thurible burns low.
Extraordinary Form of the Mass 
In the liturgical legislation in force in 1962 very precise rules were laid down about the way the thurible was used. The altar as one example would be incensed in 29 places if attached to the read wall of the sanctuary and 22 places if the altar was freestanding. Use of the 1962 texts as an extraordinary form of the Roman Rite is still permitted in accordance with the conditions laid down in the document Summorum Pontificum of 2007.
At the end of the offertory at solemn Mass in this form, the offerings are incensed by forming over them with the thurible first three crosses and then three circles, the first two anticlockwise and last clockwise. In contrast, the later form of the Roman Rite allows the priest to incense the offerings either with three swings of the thurible or by forming a cross once with the thurible over the offerings. The number of swings of the thurible while incensing the altar is also strictly prescribed.
In the celebration of a Low Mass according to the 1962 rubrics, incense is not used.
Ambrosian Rite 
In the Anglican Communion, the use of incense is a fairly reliable guide to how 'high' (more Catholic in liturgical style) or how 'low' (more Protestant) a church is. Anglo-Catholic churches may use generous quantities of incense. In recent years, some middle-of-the-road Anglican churches have taken to using incense a few times a year for special occasions.
Traditionally, at High Mass, the following rule is observed when censing, which differs from the common Roman Rite:
- Three sets of triple swings: When censing the Most Blessed Sacrament
- Three sets of double swings: When censing images, relics, and other sacramentals, also when censing the celebrant.
- Two sets of double swings: When censing a Deacon.
- One set of double swings: When censing a Sub-Deacon.
- Three sets of single swings: When censing the congregation
In Anglo-Catholic churches, the Thurible is carried in procession in front of the Crucifer and Acolytes. The Celebrant then censes the altar on which the Eucharist is to be offered, in the following form (at a Nave Altar):
- After venerating the altar, the Priest receives the thurible from the server at the North end of the altar.
- The Priest circles the altar, making small movements in the thurible, in an anti-clockwise direction until s/he reaches the west side of the altar, facing east.
- The Priest then makes three sets of triple swings towards east, then continues around the altar to his original position facing west.
This same pattern is followed when censing the altar at the offertory, with the following prequel:
- The Priest makes 6 swings (3+3) over the gifts, making the sign of the cross.
- The Priest then makes 3 circles, two counter-clockwise and one clockwise, over and around the gifts.
At the Gospel, the deacon (or whoever is reading the Gospel) censes following the introduction to the Gospel (i.e.: Hear the Gospel of our Lord Jesus Christ according to n... then cense)using three sets of double swings, one set South, one set North, and one set west.
At the elevations of the Blessed Sacrament, during the prayer of consecration, either the deacon, sub-deacon, or other appropriate person (including the thurifer), makes three sets of triple swings, as the parish bell and sanctuary bells are rung.
- Regina Coeli: Three sets of triple swings during the verse (Joy to thee, O Queen of Heaven, Alleluia...) and then three sets of triple swings during the concluding prayer.
- Angelus: One set of triple swings during each 'Ave Maria', then three sets of triple swings during the prayer (Pour forth, we beseech thee, thy grace into our hearts...)
Incense can be used at any celebration of the eucharist throughout the year, but especially in the seasons of Christmas, Epiphany and Easter, Maundy Thursday vigil, Palm Sunday, on the feasts of Pentecost, Trinity Sunday, Ascension, Feasts of saints and martyrs, Corpus Christi, and at the Dedication Festival or Patronal Festival of a church.
Byzantine Rite Eastern Catholic Churches and Orthodox Churches 
The Eastern Orthodox Church and the Byzantine Rite Eastern Catholic Churches make frequent use of incense, not only at the Divine Liturgy  (Eucharist), but also at Vespers, Matins and a number of other occasional services (see Euchologion). During funeral services and memorial services (Panikhida), the censer is swung almost continuously.
Incense is understood as symbolizing the sanctifying grace of the Holy Spirit and the prayers of the Saints rising to heaven. Incense is offered by the priest or deacon during the services. In some traditions, the ecclesiarch (sacristan) and his assistant (paraecclesiarch) will perform the censing at specific moments of the service.
The thurible (Greek: Θυμιατο, Thymiato; Church Slavonic: Кадилница, kadilnitsa) used is often gold plated (combining in itself at the offering of incense the three gifts of the Biblical Magi: gold, frankincense, and myrrh). The thurible consists of a metal bowl (usually with a base so it can stand upright) into which the charcoal and incense are placed, and a lid (often topped with a cross), pierced by holes to allow the fragrance from the incense to escape. The censer will usually have three outer chains (for the Holy Trinity) attached to the bowl, and a fourth inner chain (for the Oneness of God) attached to the lid. The three outer chains are gathered together and attached to a round conical plate attached to a ring; the inner chain passes through a hole in the conical plate and is attached to another ring to make it easier to lift the lid. In the Greek and some Russian practice twelve bells will be attached to the chains (their ringing symbolizes the teaching of the twelve Apostles). Sometimes the bowl and lid of the thurible are decorated with crosses or icons in repousse, and may even be decorated with semi-precious stones. When not in use the thurible is usually hung from a hook in the sanctuary.
When censing, the priest or deacon holds the censer below the conical plate with only one hand (the right hand) allowing it to swing freely. He will make the Sign of the Cross with the censer by making two vertical swings and a third horizontal swing (the three swings together symbolizing the Holy Trinity).
When the temple (church building) is censed, the priest or deacon will move in a sunwise (clockwise) direction, moving to his right as he censes in order the Holy Table (altar), sanctuary, Iconostasis, walls of the temple, clergy and faithful. There are two types of censing: a Greater Censing (which encompasses the entire temple and all of the people therein), and a Lesser Censing (which, depending upon the liturgical context, consists of censing only a portion of the temple and the people).
During some censings, especially the Greater Censing, the clergyman who is performing the censing will often carry a candle in his left hand. During Bright Week (the week which begins on Easter Sunday) the priest and the deacon will carry special Paschal candles at every censing, even the Lesser Censing. While carrying the Paschal candles, the priest or deacon will greet the members of the congregation with the Paschal greeting while censing them. Simple tapers are carried while censing during funerals and memorial services.
During the Eastern Roman Empire (Byzantine Empire) the emperor used to be permitted to offer incense on the Feast of the Nativity (no doubt as a memorial of the gifts of the Magi), but was permitted to perform no other priestly function.
If no priest is available, incense may be offered by a reader or senior layman, but with a hand censer which has no chains on it, but rather a handle (it often has bells as well, suspended from the handle or around the rim). The hand censer is also used in some monasteries even when a priest is present for certain censings which are done by a monastic other than a vested priest or deacon.
The faithful will often burn incense, using a hand censer, in the home during Morning and Evening Prayers, and it is not unusual for the head of the household to bless the Holy Icons and all of the members of the household with a hand censer.
Boat boy 
The boat boy or boat bearer is a junior altar server position found in Catholic and Anglican Churches. The role of a boat boy is to assist the thurifer, the senior altar server who carries the thurible. The boat bearer carries the boat, a small metal container, Latin navicula, which holds the supplies of incense. The boat has a small spoon inside which is used to transfer the grains of incense onto the red-hot charcoals in the thurible. Although at times the boat bearer transfers the incense himself, more usually he simply holds the boat open as the priest performs this task.
- Michno, Dennis G. (1998). "The Holy Eucharist-Concerning the Use of Incense at the Eucharist". A Priest's Handbook - The Ceremonies of the Church. Harrisburg, PA: Moorehouse Publishing. ISBN 0-8192-1768-9.
- Crowley, Aleister (1997). "Chapter XVI: The Magick Fire; With Considerations of the Thurible, the Charcoal, and the Incense". Magick. York Beach, ME: Samuel Weiser. ISBN 0-87728-919-0.
- Herrera, Matthew D. Holy Smoke: The Use of Incense in the Catholic Church. San Luis Obispo: Tixlini Scriptorium, 2011. http://www.smellsbells.com/incense.pdf
- General Instruction of the Roman Missal, 276
- General Instruction of the Roman Missal, 277
- Ritus servandus in celebratione Missae, VII, 10
- The form of the thurible and the manner in which it is swung can be seen in this video
|Wikimedia Commons has media related to: Thuribles|
- Holy Smoke: The Use of Incense in the Catholic Church.
- Thurifer instructions at the Cathedral Church of Saint Matthew, Dallas, Texas.
- Images of the Thurible used during Mass at All Saints' Church, King's Lynn
- About Censing rubrics, Orthodox Church in America