Magnetic flowmeter

Claim 1

A FLOWMETER COMPRISING AN ELECTRICALLY CONDUCTIVE CONDUIT FOR FLOWING LIQUID HAVING AN UNINSULATED INNER SURFACE, ELECTROMAGNETIC MEANS PROVIDING A MAGNETIC FIELD TRANSVERSE TO SAID CONDUIT, MEANS SUPPLYING CURRENT TO SAID ELECTROMAGNETIC MEANS, ELECTRODES INSULATED FROM, AND EXTENDING THROUGH OPENINGS IN, SAID CONDUIT, EXPOSED TO LIQUID FLOWING THROUGH SAID CONDUIT, AND LOCATED ON A LINE EXTENDING TRANSVERSELY THROUGH SAID FIELD TO PICK UP SIGNALS GENERATED BY FLOW OF LIQUID THROUGH SAID FIELD, MEANS CONNECTED TO SAID ELECTRODES FOR MEASURING SAID SIGNALS, AN ELONGATED CYLINDRICAL INSULATING LINER WITHIN SAID CONDUIT, SAID LINER BEING PROVIDED WITH OPENINGS IN ITS CENTRAL PORTION AT THE LOCATIONS OF SAID ELECTRODES, SAID ELECTRODES BEING IN THE FORM OF PINS EXTENDING THROUGH SAID OPENINGS, MEANS ASSOCIATED WITH SAID ELECTRODE PINS TO CLAMP SAID LINER TO THE CONDUIT, THE ELECTRODE PINS AND THE LAST MENTIONED MEANS CONSTITUTING THE SOLE MEANS SECURING THE LINER TO THE CONDUIT, THE LINER BEING OTHERWISE FREE TO MOVE RELATIVELY TO THE CONDUIT, AND RIGID MEMBERS WITHIN THE ENDS OF SAID LINER TO MAINTAIN SAID ENDS EXTENDED AND ADJACENT TO THE INNER WALL OF THE CONDUIT.