Fluid pressure-operated burette system

Claim 1

A BURETTE DEVICE COMPRISING A SYRINGE CYLINDER, OUTLET CONDUIT MEANS, A FLUID INLET, A THREE-WAY VALVE CONNECTED BETWEEN SAID CYLINDER AND SAID OUTLET CONDUIT MEANS AND FLUID INLET, SAID THREE-WAY VALVE CONNECTING SAID FLUID INLET TO SAID CYLINDER IN A FIRST POSITION AND CONNECTING SAID CYLINDER TO SAID OUTLET CONDUIT MEANS IN A SECOND POSITION, PLUNGER MEANS IN SAID CYLINDER, A PRESSURE-VACUUM SOURCE HAVING RESPECTIVE PRESSURE AND VACUUM CONNECTIONS, A WORKING FLUID LINE CONNECTED TO THE CYLINDER ABOVE SAID PLUNGER MEANS, A FLUID PRESSUREOPERATED ACTUATOR OPERATIVELY CONNECTED TO SAID THREEWAY VALVE, MEANS TO COMMUNICATIVELY CONNECT SAID VACUUM CONNECTION TO SAID WORKING FLUID LINE RESPONSIVE TO THE OPERATION OF SAID THREE-WAY VALVE TO SAID FIRST POSITION, WHEREBY TO ELEVATE THE PLUNGER MEANS IN THE CYLINDER AND DRAW FLUID INTO THE CYLINDER, AND MEANS TO COMMUNICATIVELY CONNECT SAID PRESSURE CONNECTION TO SAID WORKING FLUID LINE RESPONSIVE TO THE OPERATION OF SAID THREE-WAY VALVE TO SAID SECOND POSITION, WHEREBY TO DEPRESS THE PLUNGER MEANS IN THE CYLINDER AND DISCHARGE FLUID FROM THE CYLINDER THROUGH SAID OUTLET CONDUIT MEANS, AND WHEREIN THE MEANS TO CONNECT THE VACUUM CONNECTION AND THE PRESSURE CONNECTION TO THE WORKING FLUID LINE COMPRISES AN ELECTROMAGNETICALLY OPERATED SELECTOR VALVE AND MEANS TO ALTERNATELY ENERGIZE AND DEENERGIZE SAID SELECTOR VALVE RESPONSIVE TO THE OPERATION OF SAID FLUID PRESSURE-OPERATED ACTUATOR.