English: The mercury column resistance standard of Werner von Siemens, ca. 1860. This resistance is known as the Siemens mercury unit and is a little less than the modern ohm. (Munich 2015)
Deutsch: Widerstandsnormal von Werner von Siemens (Eine Siemens-Einheit) in Form einer Quecksilbersäule, um 1860. (München 2015)
{{Information |Description ={{en|1=Electric conductance}} {{de|1=Widerstandsnormal von Werner von Siemens (Eine Siemens-Einheit) in Form einer Quecksilbersäule um 1860}} |Source ={{own}} |Author =Reinraum |Date...