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Posted on 12:51 PM by Wanto and filed under
By Colin Morissett
In chemical processing, the wood is either burned by the process of dry distillation, with no air present, or else is decomposed by various chemical agents.
In some trees it equals two to three centimetres in a favourable year. Of the European trees great thickness is attained by the plane, chestnut, oak, lime and sycamore, and of the conifers by the fir and to somewhat lesser degree by the spruce. The "big trees" The attainable thickness of the trunk goes naturally hand in hand with the tree's attainable age.
In the mild climate of central and western Europe, the annual increment per hectare, depending on the site, type of soil and prevailing species, averages from three to ten cubic metres of wood that can be cut without decreasing the supply and production of further wood. With systematic care and fertilization this increment can be increased even further, as is shown by the plantations of cultivated hybrid poplars with an annual increment of fifteen to twenty- live cubic metres of merchantable wood.
The aspen, goat willow, birch and mountain ash may attain 100-150 years. Twice that age, from 200 to 300 years, is reached by the eastern cottonwood, hornbeam, alder, pine and larch; about 500 years by the beech and sycamore; and 700 years by the spruce and fir.
The favoured wood of the building industry is that of conifers: spruce, pine, fir and larch. It is long, light, well suited for beams, columns, sawn wood, doors, window-boxes and in building ships and transport vehicles.
In the furniture industry, it is mainly the wood of broad-leaved trees such as oak, elm, walnut, ash, beech, cherry arid certain tropical exotics that is used to make the finer, more delicate pieces. In recent decades, only thin layers, called veneers, of these costly woods are being used; they are main structure made of soft wood, thus making the final product not only lighter but also less expensive.
In some trees it equals two to three centimetres in a favourable year. Of the European trees great thickness is attained by the plane, chestnut, oak, lime and sycamore, and of the conifers by the fir and to somewhat lesser degree by the spruce. The "big trees" The attainable thickness of the trunk goes naturally hand in hand with the tree's attainable age.
In the mild climate of central and western Europe, the annual increment per hectare, depending on the site, type of soil and prevailing species, averages from three to ten cubic metres of wood that can be cut without decreasing the supply and production of further wood. With systematic care and fertilization this increment can be increased even further, as is shown by the plantations of cultivated hybrid poplars with an annual increment of fifteen to twenty- live cubic metres of merchantable wood.
The aspen, goat willow, birch and mountain ash may attain 100-150 years. Twice that age, from 200 to 300 years, is reached by the eastern cottonwood, hornbeam, alder, pine and larch; about 500 years by the beech and sycamore; and 700 years by the spruce and fir.
The favoured wood of the building industry is that of conifers: spruce, pine, fir and larch. It is long, light, well suited for beams, columns, sawn wood, doors, window-boxes and in building ships and transport vehicles.
In the furniture industry, it is mainly the wood of broad-leaved trees such as oak, elm, walnut, ash, beech, cherry arid certain tropical exotics that is used to make the finer, more delicate pieces. In recent decades, only thin layers, called veneers, of these costly woods are being used; they are main structure made of soft wood, thus making the final product not only lighter but also less expensive.
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Garden planning for the urban front garden often has to provide parking space. While it is difficult totally to hide parked cars, sensible planting can offer partial screening.
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