A mullion is a vertical element that forms a division between units of a window, door, or screen, or is used decoratively. When dividing adjacent window units, its primary purpose is to provide structural support to an arch or lintel above the window opening. Its secondary purpose may be as a rigid support to the glazing of the window. When used to support glazing, they are teamed with horizontal supporting elements called "transoms".
In the commercial door industry, the term "floating mullion" is also applied to an interlock profile which is fitted in between a pair of double swing doors.
Stone mullions were used in Armenian, Saxon and Islamic architecture prior to the 10th century. They became common across Europe in the Romanesque architecture, with paired windows divided by a mullion, set beneath a single arch becoming a fashionable architectural form. The same structural form was used for open arcades as well as windows, and is found in galleries and cloisters.
In Gothic architecture windows became larger and arrangements of multiple mullions and openings were used, both for structure and ornament. This is particularly the case in Gothic churches where stained glass is set in lead and ferramenta between the stone mullions. Mullioned windows of a simpler form continued to be used into the Renaissance and various Revival styles.
Boudinage is a geological term for structures formed by extension, where a rigid tabular body such as hornfels, is stretched and deformed amidst less competent surroundings. The competent bed begins to break up, forming sausage-shaped boudins. Boudinage is common and can occur at any scale, from microscopic to lithospheric, and can be found in all terranes. In lithospheric-scale tectonics, boudinage of strong layers can signify large-scale creep transfer of rock matter. The study of boudinage can, also, help provide insight to the forces involved in tectonic deformation of rocks and their strength.
Boudinage can develop in two ways: planar fracturing into rectangular fragments or by necking or tapering into elongate depressions and swells. Boudins are typical features of sheared veins and shear zones where, due to stretching along the shear foliation and shortening perpendicular to this, rigid bodies break up. This causes the resulting boudin to be its characteristic sausage or barrel shape. They can also form rectangular structures. ductile deformation conditions also encourage boudinage rather than imbricate fracturing. Boudins can become separated by fractures or vein material, this zone of separation is known as boudin necks.
A mullion is a structural element which divides adjacent window units.
Mullion may also refer to:
Once I bought a curious bottle,
Once I bought a bottle for fun.
Tell me what you gonna do with the bottle
When the curiousity's done.
Well I brought it out to the Bo Bo's party
Then I got it in to the company,
Then I brought it up to the boys in the backroom,
They got the knack to tune in on me,
Then I brought it up to the boys in the backyard.
I find it hard to hold on me,
I find it hard to hold, I find it hard to hold,
I find it hard to hold on me, I find it hard to hold on me,
I find it hard to hold, hard to hold, hard to hold.
You know, I've been bad, but
I would be good instead.
Ah, if my man did half of the things that he said,
I wouldn't have to go to the Bo Bo's party
I wouldn't have to go to the company,
I wouldn't have to go to the boys in the backroom,
With their knack to tune in on me,
I wouldn't have to go to the boys in the backyard.
I find it hard to hold on me,
I find it hard to hold, I find it hard to hold,
I find it hard to hold on me, I find it hard to hold on me,
I find it hard to hold, hard to hold, hard to hold.
You know, I've been bad, but
I would be good instead.
Ah, if my man did half of the things that he said,
I wouldn't have to go to the Bo Bo's party
I wouldn't have to go to the company,
I wouldn't have to go to the boys in the backroom,
With their knack to tune in on me,
I wouldn't have to go to the boys in the backyard.
I find it hard to hold on me,
I find it hard to hold on me,
I find it hard to hold.