| Siemens resistance unit |
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| Dating | 1868 - 1874 |  |
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| Maker | Tecnomasio |
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| The tool, signed "Tecnomasio Milan", is a standard resistance which has written on the brass terminals the conditions of use (23 C°), or in other words the working conditions under which this device has a conductance of exactly 1 siemens (S), the standard unit of the International System that measures the capability of a body to conduct the electric current. The standard unit siemens derives from the name of the German inventor Werner von Siemens ( 1816-1892), who contributed to the commercial use of the electric energy. |
| Web page | Siemens resistance unit |
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| Cataloghi | Nº | Voce |
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| Inv. 2016 | 532 | Siemens resistance unit Provisional numbering! |
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| Inv. 1925a | 216 | Unità di resistenza di Siemens |
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| Inv. 1870 | 328 | Unità di resistenza Siemens |
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| Section | Electrodynamics |
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| Window | R |
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| Conditions | | | Large | 6.0 cm (2.4 in) |
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| Width | 8.0 cm (3.1 in) |
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| Height | 17.0 cm (6.7 in) |
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| Materials |
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| Sources |
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Battelli A. - Cardani C., Trattato di fisica sperimentale ad uso delle università, Francesco Vallardi, Milano, 1925, Vol. 4, pag. 566, fig. 401
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| The additional indications which integrate the items of the conservation's state have the following meaning:
(?) = maybe complete; M = maintenance; P = partial; R = restored; D = used for teaching; NC = not checked; X = impossible to verify. |