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几年来的地图学教学工作,一直都是每当讲到地图投影的透视投影部分,就感觉到需要有一架透视投影仪作为直观教具,以解决学生对这一部分在理解上所遇到的困难。又加上学校指示教师应重视直观教学、创制直观教具,布置直观教学环境等等,这就促使我考虑创制透视投影仪,以解决教学上的需要。为了交流经验,愿意把它介绍出来供教学上的参考,希同志们不吝指正,以提高透视投影仪的质量。一、透视投影仪的必要组成部分与应满足的条件
In the past few years, the teaching of cartography has always been that whenever we talk about the perspective projection of a map projection, we feel that we need a perspective projector as a visual aid to solve the difficulties our students have encountered in comprehending this part. In addition, schools should instruct teachers should pay attention to visual teaching, create visual aids, layout of intuitive teaching environment, etc., which prompted me to consider the creation of perspective projector to solve the teaching needs. In order to exchange experiences, it is willing to introduce it for teaching reference, hope Greek comrades not hesitate to correct, in order to improve the quality of perspective projector. First, the necessary components and perspective projector should meet the conditions