In the 1830s, the British team of Cooke and Wheatstone developed a telegraph system with five magnetic needles that could be pointed around a panel of letters and Numbers by using an electric current.
19世纪三十年代，英国的库克和惠斯通开发了电报系统。该系统有五个磁针，通电后，可以指出一组字母和数字。
In the 1830s, the British team of Cooke and Wheatstone developed a telegraph system with five magnetic needles that could be pointed around a panel of letters and Numbers by using an electric current.
19世纪三十年代，英国的库克和惠斯通开发了电报系统。该系统有五个磁针，通电后，可以指出一组字母和数字。
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