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| Joinery |
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Finished timber fixtures of buildings such as doors, windows, panelling, cupboards, etc.
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| Jointing |
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The act of reducing the points of all knives on a planer head to coincide with the circumference of a circle when the head is rotated.
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| Joist |
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One of a series of parallel beams used to support floor and ceiling loads, supported in turn by larger beams, girders, or bearing walls.
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| Joule (J) |
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1. A unit of energy equal to the work done when a force of one newton acts through a distance
of one metre. One joule is equivalent to one watt second or 0.737 foot pounds.
2. A unit of electrical energy equal to the work done when a current of one ampere is passed
through a resistance of one ohm for one second.
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| Joystick |
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Stick or handle type input device mounted on the operator's console. Some joysticks have buttons mounted on the handle. Moving the joystick handle can send either discrete or analog input signals to the PLC.
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| Juvenile spacing |
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A silvicultural treatment to reduce the number of trees in young stands, often carried out before the stems removed are large enough to be used or sold as a forest product. Prevents stagnation and improves growing conditions for the remaining crop trees so that at final harvest the end-product quality and value is increased. See also Commercial thinning.
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| Juvenile wood |
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The innermost rings of wood adjacent to the pith, formed during the initial development of that part of the stem by the live crown. As the crown moves higher with growth in subsequent years, "mature" wood rings are formed. Certain features of juvenile wood, such as cell structure and size, differ from those typical of mature wood.
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