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用旋转针台在锥光下测定矿物的2V时,如不用马氏常数,则须用公式tanψ_(min)=sinR·cotλ计算ψ_(min)角。式中R和λ角为实测结果。该公式已有的计算图仅有λ=20°,25°,30°、35°、45°和60°几条曲线,使用不便。为此,作者设计绘制了一个λ可为60°以下任意角度的计算图(图1)。从这个计算图实测的ψ_(min)角与用公式直接计算的ψ_(min)角的对比(表1)来看,图解法的结果是令人满意的。
When measuring 2V of mineral with a rotating needle stage under the cone of light, the angle ψ_ (min) must be calculated using the formula tanψ_ (min) = sinR · cotλ without using the Martens’ constant. Where R and λ angle for the measured results. The formula has been calculated only λ = 20 °, 25 °, 30 °, 35 °, 45 ° and 60 ° several curves, the use of inconvenience. To this end, the authors designed a plot of λ at any angle below 60 ° (Figure 1). From the comparison of the measured ψ_ (min) angle of this calculation graph with the ψ_ (min) angle calculated directly from the formula (Table 1), the results of the graphical method are satisfactory.