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心电轴计算尺由“五·七”型计算尺(上海计算尺厂产品)改制而成。结构本尺由六条尺构成,自上而下为:+Ⅰ/+Ⅲ、-Ⅰ/-Ⅲ、Ⅲ、Ⅰ、+Ⅰ/-Ⅲ、-Ⅰ/+Ⅲ。Ⅰ尺为滑尺,其余为定尺。滑标固定在Ⅰ尺上,发线对准“1”处。Ⅰ、Ⅲ尺数值分别为Ⅰ,Ⅲ导联 QRS波群电压或波的代数和(mV 或 mm)的对数绝对值,简称Ⅰ、Ⅲ值。其余四尺分别为Ⅰ、Ⅲ值处于不同正、负关系时的心电轴度数。四条尺端的八个端值(左
Cardiac axis calculation rule from the “five seven” type slide rule (Shanghai calculation rule factory products) from restructuring. Structure Ruler consists of six ruler, top to bottom: + Ⅰ / + Ⅲ, -Ⅰ / -Ⅲ, Ⅲ, Ⅰ, + Ⅰ / -Ⅲ, -Ⅰ / + Ⅲ. I feet for the slide, the rest for the length. Slider fixed on the I feet, the hair line at “1”. The values of Ⅰ and Ⅲ are respectively the absolute values of logarithms (mV or mm) of the voltage or wave of QRS complex in leads Ⅰ and Ⅲ, referred to as Ⅰ and Ⅲ for short. The remaining four feet were Ⅰ, Ⅲ values in different positive and negative relationship of the number of ECG axis. The four end of the eight end value (left