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測定金属綫膨胀系数的仪器(图1)是由下列元件组成的:木座;两个金属支架:其上各有一孔使黄铜管能从中穿过;止动螺絲;带有指示板和楔栓的黄銅管。利用这个仪器时,先松开止动螺絲,并抽出黄銅管,用它在容器中搗雲,結果使管内塞满了雪。然后把管放置在原来的地方,使支架与指示板间的空隙不超过2—3毫米,且用止动螺絲将其固定起来。量出摄氏零度时由螺絲中心到指示板间黄銅管的起始长度l_0,测量精确到1毫米。在指示板与支架间
The apparatus for measuring the coefficient of linear expansion of a wire (Figure 1) consists of the following elements: a wooden block; two metal brackets: each having a hole through which a brass tube can pass; a set screw; Tied brass tube. When using this instrument, first loosen the set screw and pull out the brass tube, pound it in the container with the result that the tube is stuffed with snow. Then place the tube in its original position so that the space between the bracket and the indicator plate does not exceed 2-3 mm and secure it with retaining screws. Celsius from zero when measured by the center of the screw to the brass plate between the initial length l_0, measured to the nearest millimeter. Between the indicator and bracket