| Research and Development.
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| 1. Radius of gyration. 2. Electrical Resistance, in Ohms.
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| Dichlorodifluromethane.
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| 1.Registered Architect. 2. Return Air.
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| A corner cut out along the corner edge of a piece of wood.
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| Any channel courses supporting and protecting electrical conductors, including conduits, wireways, surface metal raceway, cable trays, floor and ceiling raceways, busways, and cable bus.
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| A mechanical device consisting of a toothed metal bar (the rack) and a small meshing gear wheel (the pinion).
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| 1. A framework or stand to support materials or objects. 2. A toothed bar that meshes with a gear wheel as in a Rack and Pinion.
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| 1. Lateral stresses exerted on an assembly. 2. In bricklaying, the method of laying the end of a wall in a series of steps so when work is resumed at a later date, the bond will continue with the old construction easily.
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| A dishwasher that accepts dishes which are loaded on metal or plastic racks.
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| Radius.
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| Electrical contact surfaces on a rotor which is perpendicular or at right angles to the shaft center line.
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| A temporary structure or mold for the support of a curved concrete wall while the concrete is curing.
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| Moving along lines diverging from a center, like spokes.
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| A unit of circular angle, equal to an angle at the center of a circle the arc of which is equal in length to the radius; one radian equals 57.2958 degrees; one degree equals 0.017454 radians.
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| Radiant heat transfer occurs when there is a large difference between the temperatures of two surfaces that are exposed to each other, but are not touching.
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| Heat transmitted by radiation.
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| A heating system in which warm or hot surfaces are used to radiate heat into the space to be conditioned.
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| Panels with integral passages for the flow of warm air or liquids; heat is transferred to a room by thermal radiation.
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| A determinate quantity adopted as a standard of measurement of radiant heating.
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| 1. Heat transformed by electromagnetic waves. 2. A net exchange of radiant energy between two bodies or objects, across an open space.
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| A heating device that transfers heat from the heated fluid within to the air outside.
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| Of wood adhesives, curing of bondlines by the application of radio frequency energy; also called High Frequency Curing.
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| Apparatus or devices that use high energy radiation in medicine.
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| A characteristic of the cross-section of the member used in the determination of its structural characteristics.
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| A straight line from the center to the circumference of a circle or sphere; one- half of the diameter.
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| A heavy radioactive gaseous element formed by disintegration of radium; it seeps out of the earth and accumulates under buildings, in some cases causing cancer in humans; easily removed by passive ventilation.
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| A footing or foundation, usually a large thick concrete mat.
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| A bolt or metal fastening device which attaches the rafters wall plate.
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| A wood or steel horizontal tension member connecting two opposite rafters to resist their spreading.
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