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Carl Louis Schwendler (1838-1882)
1882 Obituary 
. . . brought him into contact with Dr. Werner Siemens, in the immediate vicinity of whose telegraph works Schwendler had found employment in the office of a gas-engineer. After a short probation, during which he was, on account of his physical strength, employed at the anvil, he was installed in Dr. Werner Siemens’s laboratory, helping Dr. Esselbach, Robert Sabine and others in the re-determination of the Siemens mercurial unit of electrical resistance. He also assisted in making determinations of the conducting power of other metals, besides investigations on the distribution of magnetism in bars. . .