| 摘要 |
This invention relates to teaching appliances for programmed teaching of the kind including a laying-out board and answer tablets and means for securing the tablets against lateral displacement, the tablets being laid on the board in a prescribed fashion. According to the invention, the laying-out board rests on a support having checking projections and can be brought into a raised laying-out position to allow the answer tablets to be laid down, and into a lowered checking position to allow the answers to be checked; furthermore, when the laying-out board is in the checking position, the checking projections project through the board from below and, in the case of correctly laid tablets, fit into checking holes in the tablets while, in the case of incorrectly laid tablets, strike against the undersides of the tablets and prevent them from lying flat. |
