This issue presents a paper by Stefano Maddio andStefano Selleri, both of the University of Florence, on ErnstLecher (Vienna, Austria, June 1, 1856 – Vienna, Austria,July 19, 1926; Figure 1) and his main contribution toelectromagnetism. This was the technique for measuringand hence fi xing the wavelength of an oscillator. He useda spark generator in the beginning, but soon Lecher lines,so named in his honor, were used to tune audion-basedoscillators, such as the one shown in Figure 1. Indeed,Lecher lines were the key tuning mechanism in UHF fordecades. They could be found in every house in the tunersection of the TV sets up to the 1970s and beyond. Lecherlines are also still eff ectively used as an educational tool.
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机译：本期杂志由佛罗伦萨大学的Stefano Maddio和 r nStefano Selleri撰写，分别在Ernst r nLecher（奥地利维也纳，1856年6月1日–奥地利维也纳， r n 1926年7月19日；图1）及其对电磁的主要贡献。这是用于测量并固定振荡器波长的技术。起初，他使用了 n r火花发生器，但是不久之后，以他的名字命名的Lecher线就被用来调谐基于音频的 r n振动器，如图1所示。 r nLecher线是UHF十年来的关键调优机制。直到1970年代及以后，它们都可以在电视调谐器部分的每所房子中找到。 Lecher r nlines仍被有效地用作教育工具。
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