Question and answer teaching aid

Claim 1

AN EDUCATIONAL DEVICE COMPRISING A HOUSING HAVING TOP, BOTTOM, AND MARGINAL SIDE WALLS, SAID BOTTOM WALL BEING FLAT AND ADAPTED TO REST FLATWISE ON A TABLE OR THE LIKE WHEN IN USE, SAID TOP WALL BEING FLAT AND HAVING A QUESTION WINDOW AND AN ANSWER WINDOW, ONE SIDE WALL HAVING AN ELONGATED SLOT AFFORDING COMMUNICATION WITH THE INTERIOR OF SAID HOUSING AND FOR AN INSERTABLE AND REMOVABLE QUESTION AND ANSWER MEMBER, A PLATE CONFINED MOUNTED FOR ROTATION IN SAID HOUSING BENEATH THE TOP WALL, SAID PLATE BEING IN A PLANE EVEN WITH SAID SLOT AND BEING ADAPTED TO SUPPORT AND ALSO TURN SAID MEMBER WHEN THE LATTER HAS BEEN INSERTED THROUGH THE SLOT AND SEATED ATOP SAID PLATE, SAID PLATE BEING SPRING BIASED TO ASSUME AND RETAIN A GIVEN NORMAL RELATIVELY STATIONARY POSITION AND HAVING A LEVER EXPOSED FOR USE THROUGH ANOTHER SLOT PROVIDED THEREFOR IN ANOTHER SIDE WALL OF THE HOUSING IN A MANNER TO TURN THE PLATE, AND A QUESTION AND ANSWER MEMBER REMOVABLY SEATED ATOP SAID PLATE AND IN ALIGNMENT WITH SAID FIRST NAMED SLOT, SAID MEMBER COMPRISING A DISK HAVING QUESTIONS AND ANSWERS THEREON SELECTIVELY REGISTRABLE WITH THEIR RESPECTIVE QUESTION AND ANSWER WINDOWS, SAID SLOT BEING OF A LENGTH GREATER THAN THE DIAMETER OF SAID DISK AND SAID DISK HAVING MARGINALLY LOCATED HOLES THEREIN CIRCUMFERENTIALLY SPACED AND RELATED TO THE INDIVIDUAL QUESTIONS AND ANSWERS, SAID PLATE HAVING A RESILIENT ACTUATING FINGER PROVIDING A PAWL AND RELEASABLY ENGAGEABLE WITH SAID HOLES IN A MANNER TO IMPART STEP-BYSTEP CLOCKWISE MOVEMENT TO SAID DISK.