在生理实驗室的实践中,为了研究血液循环的問題,广泛地采用着卢德維希的水銀检压計。該仪器的缺点主要是由于受到它的記录部分的障碍因而不够灵敏。这些障碍包括它的浮标在描記的方向上不够垂直,以及描記部分与悬垂制約綫和鼓面的摩擦增加了描記水銀波动的阻力。在描記血压时,上述障碍的不良影响随着血压的增高而更加显著,这是水銀跑到浮标上 In the practice of physiology laboratories, Ludwig’s mercury testers are widely used to study the problem of blood circulation. The shortcomings of the instrument are not sensitive enough due mainly to the obstacles in its recorded part. These obstacles include the fact that their buoys are not vertical enough in the tracing direction, and that the friction of the tracing section with the draping line and the drumhead increases the resistance to trace mercury fluctuations. When describing blood pressure, the adverse effects of these disorders are more pronounced with increasing blood pressure, which is when mercury is running over the buoy