“带喇叭的透光屏”是用黑纸做一个遮光的喇叭筒,外口的边长约为20厘米,在筒内口的中央贴一块直径为5厘米的圆形透光屏,它是用白丝绢喷射赛珞璐溶液制成(将损坏的乒乓球剪碎,放入香蕉水制成溶液)。这样制备的屏,既能起毛玻璃的作用,又能当灯丝象映在屏上时,使学生在喇叭筒正面的较大范围内观察,也不需要在暗室中进行。 “Translucent screen with a horn” is made of black paper to make a shaded speaker, the outer side of the mouth is about 20 cm, in the middle of the mouth of the tube attached to a diameter of 5 cm circular translucent screen, it is Made of white silk jet Luo Lulu solution (the damaged table tennis ball, into the banana water solution). The screen thus prepared not only serves as a fuzzing glass but also allows the student to observe the larger area of ​​the front of the horn when the filament image is reflected on the screen and does not need to be carried out in a dark room.