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放大一张图画或者草样,普通是用的放大器,但在放大器得不到的时候,可以用一根橡皮带、一枚针和一支铅笔来替代。要放大的图,放在图画板的当中,针钉在图的左边,绘放大图的空白纸也用图画钉揿紧在板的右方。于是把橡皮筋的圈一头套在钉上,一头套在铅笔上,而在圈的中心点打上一个白线结。线结的作用,就跟放大器中的尖端一般。放大的时候,用铅笔拉橡皮筋,拉得使线结
Magnifying a picture or sketch is usually an amplifier, but when the amplifier is not available, it can be replaced with a rubber band, a needle, and a pencil. The figure to be magnified is placed on the drawing board. The pin is pinned to the left side of the drawing. The blank paper on which the enlargement is painted is also fastened to the right side of the board with a drawing pin. Then put a loop of rubber band on the nail, put it on the pencil, and put a white knot on the center of the circle. The effect of the knot is just like the tip of the amplifier. When zooming in, use a pencil to pull the rubber band and pull so that the knot