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Whereas in a conventional hand drawn technical drawing, if a mistake is found, or a modification is required, a new drawing must be made from scratch, the 2D CAD system allows a copy of the original to be modified, saving considerable time. 2D CAD systems can be used to create plans for large projects such as buildings and aircraft but provide ...
A hedge may be evergreen or deciduous, formal or informal, short or tall, depending on the style of the garden and purpose of the boundary. A wall has a strong foundation beneath it at all points, [6] and is usually – but not always – built from brick, stone or concrete blocks. A fence differs from a wall in that it is anchored only at ...
Henry Blair (c. 1807–1860) was the second African American inventor to receive a US patent. [1]He was born in Glen Ross, Maryland, United States, in 1807.His first invention was the Seed-Planter, [2] patented October 14, 1834, which allowed farmers to plant more corn using less labor and in a shorter time.
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A common type of insulated slab is the beam and block system (mentioned above) which is modified by replacing concrete blocks with expanded polystyrene blocks. [11] This not only allows for better insulation but decreases the weight of slab which has a positive effect on load bearing walls and foundations. Formwork set for concrete pour.
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