1875年5月的一天,亚历山大·贝尔到华盛顿特区旅行,拜访当时最伟大的科学家之一的约瑟夫·亨利。约瑟夫·亨利从未见过这位瘦高个、黑头发的年轻人,但他曾经听说过贝尔家族以及他们成功的聋人教学法。他对这位年轻来访者的细心留下了深刻的印象,年轻人还解释了他通过电流传送声音的理论。听完贝尔的解释,亨利说:“你有了一个伟大发明的想法,在这方面努力吧。”“先生,但是还要克服机械上的难点。那需要电的知识,而我没有。”贝尔说。“了解它!”这就是这位伟大的科学家给贝 One day in May 1875, Alexander Bell traveled to Washington, DC, to visit Joseph Henry, one of the greatest scientists of the time. Joseph Henry never saw the tall, dark-haired young man, but he had heard about the Bell family and their successful deaf pedagogy. He was impressed with the attentiveness of the young visitor, who explained his theory of transmitting sound through electricity. After listening to Bell’s explanation, Henry said: “You got a great invention idea, working on it. ” “Sir, but also to overcome the mechanical difficulties. That requires knowledge of electricity, and I do not have . ”Bell said. “Know it!” This is the great scientist to Tony