So, 50 years ago, started a story in Electronics Weekly's edition of May 17th 1961.
The story continues:
'The NationalHospital for Medical Research and the CentralMiddlesexHospital showed how the radio pill can be used to determine pressure, temperature and pH of the gastro-intestinal tract.'
'The DSIR Forest Products Research Laboratory measures the density of wood by exposing it to a radioactive isotope emitting beta particles. The quantity of particles transmitted is a function of density.'
'The radiation is detected by a scintillation counter, and the variation of density of the individual growth rings is obtained by scanning the specimen, and feeding the output from the radiation monitor into a pen recorder.'
'Electronic character recognition by auto-correlation was demonstrated by staff of the National Physical Laboratory. This device operates be selecting the major features of a character. Selection is based on the comparison of the unknown character with displaced copies of itself.'