Measuring attachment for beer keg or the like

Claim 1

AN ATTACHMENT FOR MEASURING THE AMOUNT OF LIQUID IN A PRESSURIZED KEG HAVING MEANS AT ONE END THEREOF FOR RECEIVING FLUID PRESSURE THERETO AND AN OUTLET AT THE OTHER END OF THE KEG FROM WHICH THE LIQUID IS DISPENSED UNDER PRESSURE, SAID ATTACHMENT COMPRISING: AN ELONGATED SIGHT GAUGE HAVING AN ELONGATED TUBULAR PORTION ADAPTED TO BE SECURED IN POSITION ALONGSIDE OF THE KEG, FIRST MEANS CONNECTED TO THE UPPER END OF THE SIGHT GAUGE AND ADAPTED TO BE CONNECTED TO THE INSIDE OF THE UPPER END PORTION OF THE KEG AND TO ITS SOURCE OF FLUID PRESSURE WHEREBY THE SAME PRESSURE SUPPLIED TO THE KEG IS SUPPLIED TO SAID UPPER END OF THE SIGHT GAUGE, SECOND MEANS FOR CONNECTION TO THE LOWER END PORTION OF THE KEG FOR THE DISPENSING OF LIQUID THEREFROM, THIRD MEANS INCLUDING AN ADJUSTABLE FLOW VALVE CONNECTED TO THE LOWER END OF THE ELONGATED SIGHT GAUGE AND TO SAID SECOND MEANS WHEREBY WHEN SAID VALVE IS ADJUSTED TO A LIQUID OPEN FLOW POSITION RELATIVE TO SAID SIGHT GAUGE THE PRESSURE IN THE SIGHT GAUGE WILL BE SUBSTANTIALLY EQUAL TO THE PRESSURE IN THE KEG AND CAUSE THE LIQUID IN THE SIGHT GAUGE TO ATTAIN THE SAME LEVEL AS THE LEVEL OF THE LIQUID IN THE KEG, AND WHEN SAID VALVE IS THEREAFTER ADJUSTED TO A CLOSED POSITION RELATIVE TO SAID SIGHT GAUGE, SAID ATTAINED LIQUID LEVEL IN SAID SIGHT GAUGE WILL BE ATTAINED UNTIL SAID VALVE IS AGAIN ADJUSTED TO SAID LIQUID OPEN FLOW POSITION RELATIVE TO SAID SIGHT GAUGE.