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1837年,在英国皇家研究院的实验室里,法拉第、惠斯通、丹聂尔等科学家正在进行一次非常有意义的实验,他们试图从一端插在冰里、一端放在火炉上的温差电堆中引出电火花。丹聂尔首先走上前去,拿起与温差电堆连接的两根导线,将导线的两端不停地摩擦,然而导线末端并没有产生电火花。惠斯通和法拉第也接着做了实验,结果依然相似。此时,另外一位物理学教授不慌不忙地把一根长导线绕在手指上,形成螺旋状,并在其中插进一根铁棒,并把这个线圈接到温差电偶的一根引线上。当两根线头相碰,顿时爆出了耀眼的电火花。他的成功实验博得了在场人士的赞赏,法拉第兴奋地拍着手说“:美国式的实验真了不起!”而这位了不起的美国科学家便是约瑟夫·亨利。
In 1837, scientists at Faraday, Wheatstone and Danielle were conducting a very meaningful experiment at the Royal Institutes’ Laboratory in which they tried to put thermosets Heap leads to sparks. Danielle walked up first, picked up the two wires connected to the thermopile, and kept rubbing the ends of the wire, however, without sparking at the end of the wire. Wheatstone and Faraday followed suit and the results remained similar. At this time, another professor of physics calmly put a long wire around his finger, forming a spiral, and in which an iron rod inserted, and the coil connected to a thermocouple On the lead. When the two threads meet, suddenly broke the dazzling spark. His successful experiments win the appreciation of the presence of people, Faraday excitedly clapped his hand: “American-style experiment really amazing!” And this amazing American scientist is Joseph Henry.