编辑同志: 见到今年5-6期刊登的“关于制作桥涵模型、挂图和涵洞二腊底图的情况介绍”一文中,介绍了铁四局技术人员为铁路建设适应大打“人民战争”的新创造。他们创制的桥涵模型,挂图及二腊底图是设计为施工实践服务的生动表现,是设计革命的可喜收获。我们应给予积极热情的支持。在涵洞立体图中,我提个补充修敌意见,供同志们参考。即在立体图中应利用透视原理来制图较好,否则容易给人以错觉,好象涵洞是一头(离读者远方)大,一头(离读者近方)小。对长度尺寸远比宽度尺寸为大的建筑物,其立体形象没有透视原理是表现不好的。现附 Editorial comrade: In the article “About the Production of Bridges and Culvert Models, Wallcharts, and Culverts, II, and Bottom Maps” published in the 5-6th issue of this year, we introduced the technical staff of the Fourth Railway Bureau to meet the needs of the “people’s war” for railway construction. New creation. The model of bridges and culverts created by them, the wall chart and the second base map are vivid expressions designed to serve the construction practice, and are gratifying gains for the design revolution. We should give active enthusiastic support. In the culvert’s perspective, I would like to refer to the comrades for their supplementary views on repairing hostility. That is, in the perspective drawing, it is better to make use of the perspective principle to make drawings. Otherwise, it is easy to give people an illusion, as if the culvert is one (far from the reader) and one (smaller from the reader). For buildings where the length dimension is much larger than the width dimension, the three-dimensional image does not perform well without the perspective principle. Attached