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一、装置截取玻璃管(内径23毫米左右,长约110毫米)一段,两端各配一单孔橡皮塞,孔中各插入一根一端带尖的铁棒(或用铁钉),使两个铁尖之间的距离为30毫米左右,然后按图所示将管装在托架上。
First, the device intercepts a section of glass tube (with an inner diameter of about 23 millimeters and a length of about 110 millimeters). Each end is equipped with a single-hole rubber stopper. Each of the holes is inserted with a pointed iron rod (or nails) at one end. The distance between the tips of the iron is about 30 mm, then mount the tube on the bracket as shown.