The first working telegraphs were built by several individuals in the 1830s and they began to be adopted into practical use in the 1840s prior to the laying of the first undersea telegraphic cable across the English Channel, before attempting to cross the Atlantic Ocean. A string of subsequent failures on undersea cables led to an acceptance of a need to measure, accurately, the resistance of both the wire and insulation. Prior to 1860, there was no widely accepted system of electrical units or standards. This article gives an overview of the historical development of the Ohm as a unit. In Section I , we discuss the telegraphic communication. Section II considers electrical resistance, Section III reports on the work of the British Association (BA) Committee, and Sections IV and V discuss the recognition and subsequent developments. This month’s history article takes a look at how the British Association Committee on Electrical Standards built the first internationally recognized material resistance standard, the BA unit of Resistance, subsequently called the Ohm.

中文翻译：

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欧姆作为电阻单位的标准化，1861-1867

第一个工作电报是由几个人在 1830 年代建造的，并且在 1840 年代在铺设第一条海底电报电缆穿过英吉利海峡之前，在试图穿越大西洋之前，它们开始被实际使用。海底电缆的一系列后续故障导致人们接受需要准确测量电线和绝缘层的电阻。在 1860 年之前，没有被广泛接受的电气单位或标准体系。本文概述了欧姆作为一个单位的历史发展。在第一节中，我们讨论了电报通信。第二部分考虑电阻，第三部分报告英国协会 (BA) 委员会的工作，第四和第五部分讨论认可和后续发展。