what kind of teachers did margie and tommy have

Margie and Tommy had mechanical teachers. These mechanical teachers were large, black, and ugly machines with big screens on which lessons were shown and questions were asked. They had slots where the students had to insert their homework and test papers, and students had to write their answers in a punch code. The mechanical teachers then calculated the marks immediately. Margie and Tommy's schooling took place at home through these mechanical teachers rather than in a traditional school setting with human teachers and classmates.