[USMA:27930] Metric law of july 28 1866

[john mercer]

Hello everybody.  I am a bit of a history buff.  I believe that the law making the metric system legal in the US was made law on July. 28 1866.  Is there anybody who could do some research and tell me what day of the week it was? Another question is there anywhere i can go on the net and read the law, and could i print the law out or is it classified information?  Thanks for your help.