In late 1837 he married Rebecca Roberts of Alexandria , D.C. ( now Va . ) .
He went to Paris for further studies in 1835 and was recalled to Washington to serve as an assistant at the Depot of Charts and Instruments in 1836 .
In late 1837 he married Rebecca Roberts of Alexandria , Washington ( now Va . ) .
He went to Paris for further studies in 1835 and was recalled to Washington to serve as an assistant at the Depot of Charts and Instruments in 1836 .