搜索 - 科创

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1877年4月，克罗斯撰文描述了以人的声音震动薄膜，薄膜在一块涂有碳黑的玻璃上留下了震动细痕，然后用光蚀方法，将细纹印在金属盘上，再用另一薄膜的附件在光蚀后的细纹上移动，这样薄膜就重现了原来的声音。

插座、开关、保险丝、灯座以及任何其他附件，应有尽有”。　　当时到会的有一个德国人拉特诺(Emil Rathenau )，他当场就代表他的政府把那些爱迪生的发明专利买下了。

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