b y mechanical flexure of the telescope and mounting, as w e ll as those caused by c hanges in temperatu r e. Th e third director, Romne y Ro b i nson later said that useful measurements could nevertheless be obtained b y appl y i ng cer t ain correction formulae of his to them. ... No doubt Dr Troughton Equatorial Robinson's a c tion saved t h e Telescope telescope. In Ma y 183 8, Dr Robinson emplo y ed t h e telescope to calculate the longitude difference bet w e en Armag h and Dublin. ...