Real Dictionary

teaching machine in American English
a computer or mechanical device used for programmed instruction, which provides immediate corrective feedback and, often, extra practice if needed
a mechanical, electrical, or other automatic device that presents the user with items of information in planned sequence, registers his or her response to each item, and immediately indicates the acceptability of each response

teaching machine in British English
noun: a machine that presents information and questions to the user, registers the answers, and indicates whether these are correct or acceptable