“快速测齿卡尺的研究报告”一文在本刊1956年12明发表后,到现在已两年多了。在这段过程中,对这卡尺的使用情况(实际上已将近三年)与在当时所登载的内容已有变化;也就是说,过去的内容在现在看来已不够徹底,如本刊1958年11期薛金亮同志所提出的两个问题,就是其中之一。现在对这篇研究报告作补充如下:一本刊1956年12期第4页左半面第3行中所说“此时可憑齿形的弯曲程度采取一个”和第5页右半面倒数第4行中说:“究属于何种模数,可从齿形的弯曲程度估计其为何种压力角而决定之”等说法都是不对的。如对[表二] “Rapid test tooth caliper research report,” a article published in the journal in December 1956, it has been more than two years. During this process, the use of the caliper (in fact, nearly three years) has changed from the one published at that time; in other words, the content of the past seems inadequate now, as in 1958 The two issues raised by Comrade Xue Jinliang in the 11th issue are one of them. The research report is now supplemented by the following: “In this third issue, page 4, 1956, page 4, left half of the third line,” At this moment, one can take a degree of bending according to the tooth shape “and the fifth from the penultimate half of the right half In line 4, it is incorrect to say ”what kind of modulus belongs to which pressure angle can be estimated from the degree of bending of the tooth profile". As shown in [Table 2]