Question: What technology used to be how the school that Adelaide Miethke conducted classes?
Related documents: [0]  [DOC] School of the Air is a generic term for correspondence schools catering for the primary and early secondary education of children in remote and outback Australia where some or all classes were traditionally conducted by radio, although this is now being replaced by internet technology. In these areas, the school-age population is too small for a conventional school to be viable. [END] 
[1]  [DOC] Adelaide Laetitia "Addie" Miethke, {'1': ", '2': ", '3': ", '4': "} (8 June 1881 – 4 February 1962), was a South Australian educator and teacher who was pivotal in the formation of the School of the Air using the existing Royal Flying Doctor Service radio network. [END] 
Answer: 
radio
radio