我们模型工人,有一种普遍而且每天所遇到的问题,就是做模型时的缩度,我们普通以每一尺放一分(生铁),但是这样放,往往铸件有时一些也没有缩,有时缩得太多,不够长而造成废 We model workers, there is a common and everyday problems encountered, that is, the scale of the model, we usually put a minute for each foot (pig iron), but so often castings often do not shrink, and sometimes shrink Too much, not long enough to cause waste