您刊1967年第4期刊登的浙江龙泉林机厂“增大金相摄影倍数”一文,对国产 Z 型金相摄影仪作了改进,方法很好,特别适用于设备简陋的小型试验室。在试用中,根据我们的体会,提出二点建议:1.增加投影距离,加装一个垫圈来提高放大倍数是成功的。但是,这个垫圈最好不放在取景观察器与 Your publication published in 1967, No. 4, Zhejiang Longquan Lin Machinery Plant “increase the metallographic photograph multiples ” article, made to the domestic Z-type metallographic camera made an improvement, the method is very good, especially for small and simple equipment test room. In the trial, based on our experience, made two suggestions: 1. To increase the projection distance, the installation of a washer to increase the magnification is a success. However, this washer is best not placed in the viewfinder with