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The dynamic effect on a structure,either moving or at rest,of a forcible momentary contact of another moving body.

Sound generated by impact and carried through a structure;typically, footsteps,the slamming of a door.

A rating,expressed by a single number,which is a rough measure of the effectiveness of a floor construction in providing isolation against the noise of impacts;in general,the higher the number,the greater the effectiveness.

The resistance of surface (or a material or product) to a shock,such as a hard blow.

The amount of energy required to fracture a material; a measure of the material’s resistance to mechanical shock.

A method of determining the resistance of a specimen to fracture upon the application of a dynamic physical shock.

A wrench,driven pneumatically or electrically,which produces a series of impulsive torques.

1.The broad transverse band on a door, which stretches from stile to stile and divides the panels horizontally from one another;a door rail.2.The border or framework of a panel of a door.

In painting,the thick laying of pigments. 

In alternating current electric circuits,a quantitative measure of  the opposition to the flow of current upon the application of voltage;measured in ohms.
 

The rotating member in a pump consisting of a disk with vanes attached to it;moves liquid by accelerating the liquid radially outward.

The consistency of shotcrete which contains the maximum amount of water that can be used without flow or sag after placement.

A diminished arch.

See double return stair.

Said of a soil whose particles are so closely spaced that the passage of water is either prevented or very slow.

In ceramics,that degree of vitrification evidenced visually by complete resistance to dye penetration;generally signifies zero absorption of water,except for floor and wall tile,which may absorb up to 0.5% water.
 

A ground surface that resists the infiltration of water,thereby resulting in a high rate of water runoff.

A fine grained soil,such as clay,having pores too small to permit water to pass except by slow capillary creep.

The span of a building, roof, or arch. 

On drawings,abbr. for “impregnate.” 

An indemnification which is implied by law rather than arising out of a contract.
 

In ancient Roman dwellings,a cistern set in the atrium or peristyle to receive water from the roofs.

All loads,exclusive of dead load,that a structure is to sustain.

1.A masonry unit or course,often distinctively profiled, which receives and distributes the thrust at each end of an arch.Also see abutment,springer.2.A vertical member in a gemel or double window taking the place of a mullion;an integral mullion.

A transitional member,often tapered, placed above a column capital to receive the thrust of vaults or arches.

A cloth impregnated with resin,varnish,shellac,etc.

Timber into which a flame retarder,insect poison,and/or fungicide has been forced under pressure.

The process of adding chemical preservatives,resin,or fire retardants to wood under pressure.Also see Bethell process.

improved land Land which has been provided with water,sewers,sidewalks, and other basic facilities for residential or industrial development.

Wood impregnated with resin and cured with heat and pressure to increase its strength,durability,and moisture resistance.

A structure or public utility or any other installation or physical change made in a property to increase its value and utility or to improve its appearance.

See anta and distyle in antis.

The reverse of relief,differing from intaglio in that the design is impressed into plaster or clay.

In place,as in cast-in-place concrete.

See cast-in-place concrete.

In masonry,a bond, 6 formed by headers and stretchers alternating vertically,esp.when formed at a corner, as by quoins.

Measurement of the volume of ground before it has been excavated.

A ceramic decoration applied on the surface of an unfired glaze and then matured with the glaze.

A centrifugal fan which is specially designed to be connected to the ductwork in direct line with the discharge from the fan housing.

A pump supported directly by the system piping (i.e.,the piping carries the weight of the pump);usually mounted vertically to save floor space,with its weight centered over the piping.

Abbr. for “inch.”

That leaf of a pair of doors which does not contain a lock,and to which the strike plate is fastened to receive the latch or bolt of the active leaf;usually it is fixed in a closed position by bolts at the top and bottom of the door.

See bark pocket.

In masonry,bonded or forming a bond across the thickness of a wall;composed largely or entirely of headers or bond stones.

1.On drawings, abbr. for “incorporated.”2.On drawings, abbr. for “incoming.”
 

The architecture of the Inca Empire in Peru from the 12th cent.until the Spanish conquest in the 16th cent.,particularly fortified towns with massive stonework.

Abbr. for “incandescent.”

The emission of visible light  as a result of heating.

An incandescent lamp having a blue-green glass bulb which makes the emitted light whiter by absorbing part of the yellow and red light;approximately 35% less efficient than the standard incandescent lamp. 
 

See lamp base.