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Beaufort scale symbol drawing set square - is fixed to paper and turned about mid-point
Beaufort scale symbol drawing set square - is fixed to paper and turned about mid-point
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机译:Beaufort比例尺符号图形设置正方形-固定在纸上并大约中点旋转
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摘要
The set-square is for drawing out compass cards in Beaufort scale symbols, being fixed on the drawing paper and turned about its mid-point through the required number of degrees. A slide is moved over it and secured in position to enable the symbol to be drawn by pencil etc.(0/1)
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