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| Computer aided design and drafting (cadd)
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Also referred to as CADD, it is a graphics program used on computers so that drawing can be done in two or three dimensions with the three dimensional designs able to be animated to be viewed from different angles, including from the inside of the drawing. Installation or maintenance can be simulated by the movement of various parts during animation. Animation can be used for simulations, situation re-enactments demonstrations and education. CADD programs can be used to design items, systems and structures of all sizes and complexities and are increasingly used for designing or planning construction sequences and logistics for building projects as well as landscaping designs. Drawn to scale with dimensions shown by computer the measurements can be taken electronically. |
| Concave
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Hollow and curved such as the inside of a hollow sphere. |
| Concave joint
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Joint which is made in water-resistant mortar. |
| Concealed arm carrier
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One of a variety of common mechanisms to securely mount a wall-mount lavatory. Unlike a hanger which only supports the lavatory where it meets the wall, the carrier has long arms onto which the lavatory slides. |
| Concealed hinges
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Invisible hinges when the door is not open. |
| Concealed nail
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Installation of roll roofing method of roofing installation where each course of roll roofing covers the nails in the prior course by overlapping it. Roofing cement holds down the edges of the courses, bonding them to each other. |
| Concealed wiring
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Electric wiring that is inside the walls of a building. |
| Concentrator collector
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A solar collector that uses reflective surfaces to concentrate sunlight onto a small area, where it is absorbed and converted to heat or, in the case of solar photovoltaic (PV) devices, into electricity. Concentrators can increase the power flux of sunlight hundreds of times. The principal types of concentrating collectors include. |
| Concentric
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Having a center in common. A circle within a circle. |
| Concentric zone theory
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Land development theory that an urban area expands, in rings. The inner ring being the business district; ring 2 has manufacturing, warehousing and some commercial activity; ring 3 is low social economic status housing; ring 4 has middle-income housing; ring 5 has new high social economic status housing. |
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