Mendenhall Order
1893 official standardization for Metre-based systems of measurement in the USA / From Wikipedia, the free encyclopedia
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The Mendenhall Order marked a decision to change the fundamental standards of length and mass of the United States from the customary standards based on those of England to metric standards.[1] It was issued on April 5, 1893, by Thomas Corwin Mendenhall, superintendent of the United States Coast and Geodetic Survey, with the approval of the United States Secretary of the Treasury, John Griffin Carlisle. The order was issued as the Survey's Bulletin No. 26 – Fundamental Standards of Length and Mass.