George and William Streets. Possible location.
This is a T-junction, so there are only two corners, and the prisoner barracks/penitentiary was on the SW corner. The remaining SE corner is this one:
1835 James Griffiths, Globe Inn, Launceston
1836 Thomas Faro, Globe Inn, George & William Streets
Launceston Advertiser, 4 June 1835
Launceston Advertiser, 18 February 1836
Cornwall Chronicle, 8 July 1837