一、公式来源:本表系根据一、二、三、四等水准测量细则中四等水准限差式公:△=20mmL~(1/2)了解算为公(△/20mm)~2=L。用20除误差△,再将其商数平方进三位即得限差数之相应的以公尺为单位之系长。二、排列方法:排列方法与常用对数表同,L栏相当于常用对数表之对数栏,其中△及△′栏相当于常用对数表之真数栏(△及△′表限差以米厘为单位,L表系长,以公尺为单位)。为了便 First, the formula source: This table is based on one, two, three, four levels of measurement standards in the fourth-class level of tolerance public: △ = 20mmL ~ (1/2) to understand as public (△ / 20mm) ~ 2 = L. In addition to the error with 20 △, then the quotient square into three that is the difference between the corresponding number of meters in the Department of length. Second, the arrangement: arrangement method and common logarithm table, L column is equivalent to the common logarithmic table of the logarithmic column, where △ and △ ’column is equivalent to the real number of common logarithm table (△ and △’ table limit The difference in meters as a unit, L table length, in meters as a unit. For the sake of it