Appendix 4: Brief survey of the present television situation
Prior to engaging in television development, the Gramophone Company carried out a survey of the patents which related to television, and made assessments of the systems which were then being engineered. The company's conclusions influenced its future television policy and led to its work on zone television. Extracts from the 'Brief Survey of the Present Television Situation' are given at length, since the unpublished survey is unique and has some historical importance. The document highlights the 1930 patent position, the limitations of the various existing low-definition television systems and the need for a 'picture of at least 150 lines'.