Metric Act of 1866
| Long title | An Act to authorize the Use of the Metric System of Weights and Measures |
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| Enacted by | the 39th United States Congress |
| Citations | |
| Statutes at Large | 14 Stat. 339 (1866) |
| Legislative history | |
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The Metric Act of 1866, also known as the Kasson Act, is a piece of United States legislation that legally protected use of the metric system in commerce from lawsuit, and provided an official conversion table from United States customary units.