Career
He contributed profusely to the "Report on the United States and Mexican boundary survey" of which the first volume was published in 1857. Weyss was in charge of detailed mapping at St. Petersburg when it was besieged during the American Civil War. Weyss in turn reported to Major Nathaniel Michler, head of the topographic department for the Army of the Potomac.
Michler graduated from West Point Military Academy in 1848.
