From this single length standard all other weights and measures were to be derived. expressed in the decimal system. In 1799. a meter bar and kilogram weight were constructed of platinum and deposited In the Archives of the French Republic. Iron copies were reproduced for distribution. One set found Its way to the United States in 1805. the personal property of Ferdinand R. Hassler. a Swiss immigrant highly trained in mathematics. who later became our first superintendent of weights and measures. Discussions of conversion to the metric system popped up through the years and finally in 1866 the Congress. authorized permissive and legal use of the metric system. Then in 1869.
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