Multiple probe impedance measuring device

Claim 1

APPARATUS FOR DETERMINING THE IMPEDANCE RELATION BETWEEN A TRANSMISSION MEDIUM FOR RADIO FREQUENCY WAVES AND A DEVICE TERMINIATING THE MEDIUM AND REFLECTING THE WAVES, SAID APPARATUS COMPRISING A GENERATOR OF VARIABLE RADIO FREQUENCY ENERGY FOR TRANSMISSION BY SAID MEDIUM, ELECTRIC WAVE DETECTION MEANS DISPOSED IN THE PATH OF THE WAVES TO PROVIDE UNMODULATED SIGNALS REPRESENTING THE WAVE AMPLITUDES AT THREE LOCATIONS ALONG SAID PATH AT INTERVALS OF ONE-EIGHTH WAVE LENGTH, MAGNETIC WAVE DETECTION MEANS DIPOSED IN SAID PATH AT THE SAME AXIAL LOCATION AS THE MIDDLE ONE OF SAID ELECTRIC WAVE DETECTION MEANS, FIRST CIRCUIT MEANS TO COMBINE THE SIGNALS REPRESENTING THE ELECTRIC WAVES AT THE OUTER ONES OF SAID LOCATIONS AND TO PRODUCE THE DIFFERENCE OF SAID SIGNALS, SECOND CIRCUIT MEANS TO COMBINE THE SIGNALS REPRESENTING THE ELECTRIC AND MAGNETIC WAVES AT SAID MIDDLE LOCATION AND TO PRODUCE THE DIFFERENCE OF SAID SIGNALS, AND MEANS TO INDICATE POINTS WHOSE RECTANGULAR COORDINATES ARE DEFINED BY THE DIFFERENCE SIGNALS.