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| Bottom chord
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Lowest structural part of a truss. |
| Bottom heat
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Undersurface heat provided in the soil by electric cables or hot water pipes. |
| Bottom plate
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Also called a sole plate, this is the board on which the bottoms of the wall framing studs stand. |
| Bottoming-cycle
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A means to increase the thermal efficiency of a steam electric generating system by converting some waste heat from the condenser into electricity. The heat engine in a bottoming cycle would be a condensing turbine similar in principle to a steam turbine but operating with a different working fluid at a much lower temperature and pressure. |
| Bottomland
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Land adjacent to a body of water that can also be part of a flood plain or land at the bottom of a valley or glen, which is usually fertile as top soil. |
| Boulder
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Extremely large rock. |
| Boulevard
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A tree lined street, sometimes constructed with a landscaped median. |
| Boundary
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Dividing line between two adjacent properties. |
| Bow
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The distortion of lumber in which there is a deviation, in a direction perpendicular to the flat face, from a straight line from end to end of the piece. |
| Bow compass
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Device, which consists of two legs, joined together with a hinged joint that is used for drawing circles. The pointed leg is held in place and the leg, which holds a pencil, or pen is rotated around to draw a circle. |
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