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1.选用外径较细的铁丝(笔者用的是外径0.3毫米,即一般作橱窗用的铁纱布上的细铁丝即可),长约40～50厘米一段,在酒精灯焰上将细铁丝依次逐段灼烧至红热,以便除去细铁丝表面的覆盖物。同时,两手握着细铁丝向两端稍稍用力,以便拉直细铁丝上的弯曲部分。之后,用较细的砂纸打磨铁丝表面,使之光洁,随之弯曲成为符合实验所需要的螺旋丝,再将此丝状螺旋,平整地放置在石棉片上加热。同时,用角匙取少许二氧化二铬固体,轻轻撒布在丝状螺旋铁丝上面。因二氧化二铬固体遇着较热
1. Select a wire with finer outer diameter (I use an outer diameter of 0.3 mm, which is generally used as a thin wire on the iron gauze for the window), about 40 to 50 centimeters in length, and will be fine on the flame of the alcohol lamp. The wire is fired sequentially to red heat in order to remove the cover of the surface of the wire. At the same time, hold the thin wire in both hands and apply a little force to both ends to straighten the curved part of the thin wire. After that, the surface of the wire was polished with finer sandpaper to make it smooth and then bent into a spiral wire that meets the requirements of the experiment. This wire spiral was then placed flat on an asbestos sheet and heated. At the same time, take a small amount of chromium dioxide solids with a horn and spread lightly on the wire spiral wire. Due to the heat of the chromium dioxide solids