为了使没有幻灯机的学校有可能放大复制生物教学用挂图,介把一种简便的方法,以供大家参考: 1.工具:墨笔、玻璃(比原图稍大一些)一块、手电筒一只、铅笔和纸。 2.步骤:首先将玻璃复于要放大的图画底稿上,用墨笔把图稿上的形象全部描绘在玻璃上。然后将玻璃垂直固定于桌上,使手电筒的光透过玻璃(要在黑暗中进行),把玻璃上的图象映在固定于 In order to make it possible for a school without a slide projector to enlarge and duplicate a biological teaching chart, a simple and convenient method is provided for your reference: 1. Tool: ink pen and glass (a bit larger than the original one), a flashlight, Pencil and paper. 2. Steps: First, the glass complex to be enlarged to enlarge the drawing on the manuscript, with the ink pen on the image of the drawings are all painted on the glass. The glass is then fixed vertically to the table so that the flashlight’s light is transmitted through the glass (to be done in the dark) and the image on the glass is fixed to