Position indicating means

Claim 1

A POSITION RESPONSIVE SIGNAL GENERATOR COMPRISING: A SUBSTANTIALLY U-SHAPED ELECTROMAGNET; A SOURCE OF PULSELIKE VOLTAGE CONNECTED TO SAID ELECTROMAGNET; A SUBSTANTIALLY U-SPAPED FLUX PERMEABLE CORE HAVING A COIL INDUCTIVELY ASSOCIATED THEREWITH MOUNTED WITH ITS GAP IN GENERALLY OPPOSED RELATION TO THE GAP IN SAID ELECTROMAGNET AND SPACED THEREFROM A SUFFICIENT DISTANCE AS TO BE SUBSTANTIALLY UNAFFECTED BY THE INVERSE SQUARE LAW EFFECT OF THE FLUX GENERATED BY THE ELECTROMAGNET; A SUPPORT BODY MOUNTED FOR MOVEMENT ALONG A PATH OF PREDETERMINED DIRECTION AND DISTANCE WITH RESPECT TO A REFERENCE BASE BETWEEN THE ELECTROMAGNET AND CORE; A PAIR OF LOW MAGNETIC RELUCTANCE MEMBERS CARRIED BY SAID BODY ARRANGED IN SPACED RELATION TO ONE ANOTHER SUCH THAT A FIRST PAIR OF PORTIONS OF THE SAID MEMBERS ARE BROUGHT INTO SUBSTANTIAL REGISTRY WITH THE LEGS OF SAID ELECTROMAGNET AND IN SEPARATE PHYSICAL CONTACT THEREWITH AS THE BODY MOVES ALONG THE PATH, AND A SECOND PAIR OF PORTIONS OF THE SAID MEMBERS SEPARATED BY A DISTANCE LESS THAN THE GAP IN SAID CORE ARRANGED TO PRESENT THE SPACE BETWEEN THE SAID SECOND POTIONS IN COINCIDENCE WITH THE GAP IN SAID CORE SIMULTANEOUSLY ON OBTAINING THE POSITION OF REGISTRY OF SAID FIRST PORTIONS WHEREBY AN INDICATION VOLTAGE SIGNAL IS INDUCED IN SAID COIL FOR EACH VOLTGAGE PULSE INPUT TO THE ELECTROMAGNET DURING GAP COINCIDENCE.