温州第七中学电子厂广大工人、技术人员和革命教师,在校党支部的领导下,遵照毛主席关于“我们必须打破常规,尽量采用先进技术”的教导,学习上海有关单位的经验,对幻灯机进行了改革,经过半年来的实践,终于试制成功BH-A型白昼幻灯机。白昼幻灯机系采用国产新光源——溴钨灯集光成象,光亮度有了很大的提高,因此白天可以在室内放映,这就克服了目前一般幻灯机只能在晚上或暗室里放映的局限性。同时由于 Under the leadership of the school party branch and under the guidance of Chairman Mao Zedong’s “We must break the routine and try our best to adopt advanced technology”, the workers, technicians and revolutionary teachers in the Seventh Middle School of Wenzhou University learned the experience of the relevant units in Shanghai, After the reform, after six months of practice, we finally succeeded in making a BH-A daytime slide projector. The daytime slide projector uses domestically made new light source - Bromine tungsten lamp to collect the image, the brightness has been greatly improved, so it can be displayed in the room during the day, which overcomes the limitation that the general slide projector can only be displayed at night or in the dark room Sex. At the same time due