试制经过制图部门用以复照制版的玻璃底片,每晒一张蓝图约需6分钟,同时由于玻璃板量多、质重难予保管,即使保存得好,也会产生玻璃板长期积压,不能周转的缺陷,我们为了提高晒图效率、寻找容易保存底图的办法,并减少以人工墨绘腊纸底图所化费的时间,在今年4月底开始试验用玻璃底片复制黑晒腊纸底图。由于试验中首先解决了腊纸下水后的平坦与伸缩问题,为复制黑晒腊纸底图打下了可靠的基础,试验中先后研究了8种配方与黑晒方法,在叶剂配合量上也进行了多次试验,最后选定上海测量总队和重庆西南地质局两种黑晒方法与配 Trial production After the drawing department used to copy the plate glass, it took about 6 minutes to print a blueprint. At the same time, due to the large amount of glass plates, the quality of the plates was difficult to keep, even if they were well-preserved, there would be a long-term backlog of glass plates. In order to increase turnover efficiency, we have tried to improve the efficiency of blueprinting, to find ways to save the base map, and to reduce the time spent on drawing the base map of artificial ink. At the end of April of this year, we began to reproduce the black base paper with a glass film. . Since the test first solved the problem of flatness and retraction after the wax paper was launched, it laid a solid foundation for the reproduction of the black bacon paper base map. Eight formulas and black drying methods were studied successively in the test. A number of tests were conducted. Finally, two methods of black-lighting were selected: Shanghai Surveying Corps and Chongqing Southwest Geological Bureau.