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1.制做方法取一段长约45厘米内径均匀的细玻璃管,用酒精喷灯加热弯制成如图1所示的形状,左管上端的弯曲部分是为便于水的溢出而设计的。右管比左管高出5cm,在同高度处标以0刻度。将一条画有毫米刻度且刻度值自上向下递增的纸条贴在右管上,使0刻度与管上的0线对齐。再将此U形管
1. Making method Take a thin glass tube with a uniform inner diameter of about 45 cm, heated and bent with an alcohol torch to form the shape shown in Fig. 1. The curved portion at the upper end of the left tube is designed to facilitate the overflow of water. The right tube is 5 cm taller than the left tube, and it is marked with 0 scale at the same height. A piece of paper with a millimeter scale and a scale value increasing from top to bottom is affixed to the right tube so that the 0 scale aligns with the 0 line on the tube. Then this U-shaped tube