1. AN EDUCATIONAL APPARATUS FOR SELF TEACHING OF TYPEWRITING COMPRISING A FLAT BACKING MEMBER HAVING HINGE MEANS POSITIONED AT OPPOSITE TOP AND BOTTOM EDGES THEREOF, A PLURALITY OF LESSON SHEETS HINGED TO THE TOP EDGE OF SAID BACKING MEMBER, SAID SHEETS BEARING CODED INDICIA REPRESENTING ABOUT FOUR SELECTED TYPEWRITER KEYS IN CORRELATED POSITIONS ON THE BOTTOM PORTION OF EACH SHEET AND BEARING AN INDICIA CODE AND INSTRUCTIONS ON THE TOP PORTION OF EACH SHEET, A FLAT TYPING BOARD HINGED TO SAID BOTTOM EDGE OF SAID BACKING MEMBER, SAID BOARD HAVING A PLURALITY OF HOLES SIMULATING THE COMPLETE KEYBOARD OF A TYPEWRITER AND ADAPTED TO OVERLIE THE BOTTOM PORTION OF SAID LESSON SHEETS TO EXPOSE SAID CODED INDICIA THROUGH CORRESPONDING HOLES IN SAID BOARD, A PLURALITY OF DISCS OF SUBSTANTIAL THICKNESS SIMULATING TYPEWRITER KEYS CODED TO CORRESPOND TO THE INDICIA ON SAID LESSON SHEETS, AND MEANS FOR REMOVABLY SECURING SAID DISCS IN SELECTED HOLES OF SAID TYPING BOARD TO WITHSTAND INADVERTENT DISPLACEMENT THEREOF BY NORMAL DIGITAL TYPEWRITING STRIKES ON SAID DISCS.