Device for self-learning without teacher for self-education, has corrector providing connection between two points of metal ink printed on lower layer of programmed dual-layer sheet, which includes upper layer contained with holes

摘要

The device has a programmed dual-layer sheet and a corrector, which includes a stack and two or more lights e.g. green and red lights, connected with two circuits. The corrector ignites in green lighting for a right answer for one of the circuits and in red lighting for wrong answers for the other circuit. The sheet has upper and lower layers connected with each other. The corrector provides a connection between two points of metal ink printed on the lower layer of the sheet. The upper layer of the sheet is contained with holes.