Certificate issued by the Standard Weights and Measures Department of the Board of Trade recording receipt by Joule of a standard of measure described as "A flat steel straight edge upon the bevil of which is marked the measure id at 62 degrees F when measured along the out edge of the bevil is... 35.99967 inches..."
Certificate
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- ReferenceGB 133 JPJ/40
- Dates of Creation13 Apr 1877
- Physical Description1 sheet