Method and apparatus for converting cartograph coordinates to permanent digital form

Claim 1

IN A MEASURING DEVICE FOR CONVERTING THE COORDINATES OF A POINT ON A CARTOGRAPH TO PERMANENT DIGITAL FORM, A FIRST GRID COMPRISING A PLURALITY OF SPACED, SUBSTANTIALLY PARALLEL CONDUCTORS; A SECOND SIMILAR GRID ALSO COMPRISING A PLURALITY OF SUBSTANTIALLY PARALLEL, SPACED CONDUCTORS; SAID GRIDS BEING IN NORMAL RELATIONSHIP WITH RESPECT TO EACH OTHER; SAID GRIDS BEING SUPPORTED BY AT LEAST ONE ELECTRICALLY CON-CONDUCTIVE MEMBER; FIRST AND SECOND ELECTRICALLY CONDUCTIVE MEANS DISPOSED IN JUXTAPOSITION TO THE CORRESPONDING GRIDS; RESILIENT MEANS ADAPTED TO MAINTAIN SAID GRIDS AND SAID CONDUCTIVE MEANS OUT OF ELECTRICAL CONTACT WITH RESPECT TO EACH OTHER BUT TO PERMIT CONTACT UPON THE APPLICATION OF COMPRESSIVE FORCE THEREBY CAUSING A DISCRETE NUMBER OF CONDUCTORS IN BOTH SAID FIRST AND SECOND GRIDS TO MAKE ELECTRICAL CONTACT WITH SAID CONDUCTIVE MEANS; A VOLTAGE-DIVIDING MEANS CONNECTED TO SAID CONDUCTORS; A POWER SOURCE MEANS TO CONNECT SAID VOLTAGE-DIVIDING MEANS TO SAID POWER SOURCE; MEANS FOR MEASURING THE VOLTAGES IMPR ESSED BY SAID VOLTAGE DIVIDING MEANS ON SAID CONDUCTORS; MEANS FOR TRANSLATING SAID VOLTAGES INTO DECIMAL DIGIT SIGNALS AND MEANS FOR RECORDING SAID SIGNALS.