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The Probert Encyclopaedia of Architecture

IGLOO

Picture of Igloo

An igloo is a dome-shaped Inuit house, usually built of turf and blocks of hard, solid snow.
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IMPASTO

In mural painting, impasto refers to the application of paint in a thick layer.
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IMPLUVIUM

In Roman dwellings, an impluvium was a cistern or tank, set in the atrium or peristyle to receive the water from the roof, by means of the compluvium. They were generally made ornamental with flowers and works of art around the brim.
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IMPOST

In architecture an impost is the top member of a pillar, pier, wall, etc., upon which the weight of an arch rests. The impost is called continuous, if the mouldings of the arch or architrave run down the jamb or pier without a break.
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INCRUSTATE

In architecture an incrustate is a covering or inlaying of marble, mosaic, etc., attached to the masonry by cramp irons or cement.
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INFLECTED-ARCH

Picture of Inflected-Arch

In architecture, an inflected-arch is an arch the curve of whose flanks is reversed near the crown, so as to terminate in an acute angle.
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INN

Originally, the term inn was applied to a mansion. Hence we find names such as 'Lincoln's Inn' referring to the former mansion of the Earls of Lincoln, and of 'Gray's Inn' referring to the former residence of the Lords Gray.
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INNER PLATE

In architecture an inner plate is the wall plate which lies nearest to the centre of the roof, in a double- plated roof.
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INSIDE FINISH

In architecture inside finish is a general term for the final work in any building necessary for its completion, but other than the unusual decoration; thus, in joiner work, the doors and windows, inside shutters, door and window trimmings, panelled jams, baseboards, and sometimes flooring and stairs; in plaster work, the finishing coat, the cornices, centre-pieces, etc.; in painting, all simple painting of woodwork and plastering.
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INTERCOLUMNIATION

In architecture the intercolumniation is the clear space between two columns, measured at the bottom of their shafts. It is customary to measure the intercolumniation in terms of the diameter of the shaft, taken also at the bottom. Different words, derived from the Greek, are in use to denote certain common proportions.
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INTERLACING ARCHES

In architecture interlacing arches are arches, usually circular, so constructed that their archivolts intersect and seem to be interlaced.
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INTERPENETRATING MOULDING

In late Gothic architecture, an interpenetrating moulding is a decoration by means of mouldings which seem to pass through solid uprights, transoms, or other members. They are often two sets of architectural members penetrating one another, in appearance, as if both had been plastic when they were put together.
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INTERTIE

In architecture an intertie is a horizontal tie other than a sill and plate or other principal tie, securing uprights to one another.
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INTRADOS

In architecture an intrados is the interior curve of an arch. The term is especially applied to the inner or lower curved face of the whole body of voussoirs taken together.
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INVERTED ARCH

In architecture an inverted arch is an arch placed with the crown downward. They are much used in foundations.
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IONIC

Picture of Ionic

In architecture the term Ionic refers to a structure or style pertaining to the
Ionic order of architecture, which is one of the three orders invented by the Greeks, and one of the five recognized by the Italian writers of the sixteenth century. Its distinguishing feature is a capital with spiral volutes.
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IRISH ROLL

Picture of Irish Roll

The Irish roll is a simple, plain style of tall clay chimney pot, wider at the lower half than at the top, with a distinct shoulder about half way along its length and a rounded lip at the top.
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