Micrometer

Claim 1

AN ELECTRONIC MICROMETER COMPRISING, IN COMBINATION: A FIRST MEMBER HAVING A MICROMETER SURFACE; A SECOND MEMBER HAVING A MICROMETER SURFACE; MEANS MOUNTING SAID FIRST AND SECOND MEMBERS FOR RELATIVE MOVEMENT WITH RESPECT TO EACH OTHER TO BRING SAID SURFACES INTO ENGAGEMENT WITH A WORK; MEANS RESPONSIVE TO MOVEMENT OF SAID FIRST MEMBER RELATIVE TO SAID SECOND MEMBER FOR GENERATING A SERIES OF ELECTRICAL PULSES PROPORTIONAL IN NUMBER TO THE CHANGE IN DISTANCE RESULTING FROM THE RELATIVE MOVEMENT, SAID MEANS INCLUDING DIRECTION SENSING MEANS SUCH THAT SAID ELECTRICAL PULSES CONSTITUTE RIGHT MOVING PULSES WHEN SAID SECOND MEMBER MOVES RELATIVELY TO SAID FIRST MEMBER IN ONE DIRECTION AND LEFT MOVING PULSES WHEN SAID SECOND MEMBER MOVES RELATIVELY TO SAID FIRST MEMBER IN AN OPPOSITE DIRECTION; COUNTER MEANS INCLUDING AN ADD PULSE INPUT AND A SUBTRACT PULSE INPUT; A ZERO SET CIRCUIT; A RIGHT OF ZERO SWITCHING MEANS; AT LEFT OF ZERO SWITCHING MEANS; A RIGHT OF ZERO ENABLING MEANS ELECTRICALLY CONNECTED TO SAID RIGHT OF ZERO SWITCHING MEANS; AND A LEFT OF ZERO ENABLING MEANS ELECTRICALLY CONNECTED TO SAID LEFT OF ZERO SWITCHING MEANS, SAID ZERO SET CIRCUIT BEING ELECTRICALLY CONNECTED TO SAID COUNTER MEANS AND RESPONSIVE TO A ZERO READING ON SAID COUNTER MEANS TO ESTABLISH AN ENABLING CONDITION IN SAID RIGHT OF ZERO AND LEFT OF ZERO ENABLING MEANS SUCH THAT SAID RIGHT OF ZERO SWITCHING MEANS CONNECTS SAID RIGHT MOVING PULSES TO SAID ADD PULSE INPUT AND SAID LEFT MOVING PULSES TO SAID SUBTRACT PULSE INPUT IN RESPONSE TO A RIGHT MOVING PULSE RECEIVED BY SAID RIGHT OF ZERO SWITCHING MEANS THROUGH SAID RIGHT OF ZERO ENABLING MEANS IMMEDIATELY AFTER SAID ZERO SET CONDITION, AND SAID LEFT OF ZERO SWITCHING MEANS CONNECTS SAID RIGHT MOVING PULSES TO SAID SUBTRACT PULSE INPUT AND SAID LEFT MOVING PULSES TO SAID ADD PULSE INPUT IN RESPONSE TO A LEFT MOVING PULSE RECEIVED BY LEFT OF ZERO SWITCHING MEANS THROUGH SAID LEFT OF ZERO ENABLING MEANS IMMEDIATELY AFTER SAID ZERO SET CONDITION, WHEREBY THE READING DISPLAYED BY SAID COUNTER REPRESENTS A GIVEN DISTANCE MOVED EITHER TO THE RIGHT OR LEFT OF AN INITIALLY ESTABLISHED REFERENCE DISTANCE AT WHICH SAID COUNTER MEANS READS ZERO.