<P> In support of its decision favoring the Pittsburg spelling, the Board referenced the printed copies of the 1816 city charter which featured that same spelling . Based on those copies of the city charter, the Board claimed that the official name of the city had always been Pittsburg . However, the members of the board seem to have been unaware that the original copy of the 1816 charter specified the name of the city to be Pittsburgh, and that only the printed copies of the charter featured the erroneous spelling Pittsburg . The full decision and rationale from the Board follows: </P> <P> Pittsburg . Pennsylvania . The city was chartered in 1816, its name being spelled without the h, and its official form is still Pittsburg . The h appears to have been added by the Post-Office Department, and through that action local usage appears to have become divided . While the majority of local newspapers print it without the h, certain others use the final h . </P> <P> The Board's decisions had limited but effective power; they were compulsory upon all federal government agencies, including the Post Office . The decisions were not, however, binding outside the federal government . Official city and state documents continued to use the old spelling, as did the Pittsburgh Gazette, the Pittsburgh Stock Exchange and the University of Pittsburgh . Responding to mounting pressure and, in the end, political pressure from senator George T. Oliver, the United States Geographic Board (a successor to the original United States Board on Geographic Names) approved the Pittsburgh spelling on July 19, 1911, reversing the previous decision on the matter . The letter sent to senator Oliver to announce this decision, dated July 20, stated: </P> <P> Hon . George T. Oliver, United States Senate: </P>

When did the h get added to pittsburgh