16. Apparatus according to claim 15 further comprising timing means for triggering renewed operation of said word selection means upon the elapse of a predetermined cycle interval.
15. A machine for teaching students to read comprising: visual display means for receiving encoded letter combinations to provide visual images thereof as transmitted thereto, storage means having a plurality of memory locations in which sets of letter combinations are separately stored in electronically encoded form, logic processing means to address said memory locations one at a time and to provide to said visual display means encoded letter combinations as said letter combinations are received from said addressed memory locations, word selection means connected to said storage means to randomly select from among the addresses of letter combinations addressed and to sequentially extract letter combinations therefrom and transfer said extracted letter combinations at said selected addresses to said logic processing means for display.