用爱迪生发明电灯的事例证明观点"成功需要持之以恒"300字
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爱迪生发明电灯的故事》在电灯还没有发明之前,天一黑下来,人们只能靠月光、火把、蜡烛、胡桃油点燃的油灯来照明.
今天,我们的夜晚灯火通明,这正是美国一位伟大发明家的功劳,他就是爱迪生.
在一百多年前,人们开始使用最早的电灯——弧光灯.但是,30岁的爱迪生看到弧光灯灯光微弱,又容易伤眼睛,还要不停地更换用来燃烧的炭条.他不顾别人笑话他是傻子,大胆提出要把弧光灯变为白光灯,想使电灯灯亮、照明时间更长.
要找到合适的灯丝材料十分不容易,爱迪生做了无数次不同的试验,结果都失败了.但是他仍然坚持每天在实验室工作到清晨,累了就头枕两三本书,躺在实验用的桌子下面睡一会.
终于在三年后的一天,爱迪生把芭蕉扇边上的一条竹丝撕成细丝,做成一根灯丝,结果发明了一种白热电灯——竹丝电灯.
又过了好几年,他用钨丝代替竹丝,最终发明了今天人们还在使用的白炽电灯——钨丝电灯
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