Method and means for indicating changes in the composition of a gas

Claim 2

THE PROCESS OF INDICATING A CHANGE IN THE COMPOSITION OF A GAS WHICH COMPRISES PASSING A SAMPLE OF THE GAS AT A CONSTANT LOW PRESSURE THROUGH A ZONE WHERE IT IS SUBJECTED TO A BOMBARDMENT OF SLOW ELECTRONS TO FORM A FIRST GROUP OF POSITIVE IONS AT A RATE DEPENDENT UPON THE COMPOSITION OF THE GAS, COLLECTING SAID FIRST GROUP OF POSITIVE IONS ON A NEGATIVELY CHARGED PLATE, MEASURING THE ELECTRIC CURRENT RESULTING THEREFROM, AND PROTECTING SAID FIRST GROUP OF POSITIVE IONS FROM CONTAMINATION WITH A SECOND GROUP OF POSITIVE IONS FORMED FROM SUCH PORTIONS OF SAID GAS AS COME IN CONTACT WITH THE SOURCE OF SUCH ELECTRONS AND CRACK THEREON BY REPELLING SAID SECOND GROUP OF POSITIVE IONS WITH A POSITIVELY CHARGED SCREEN.

Claim 3

IN A GAS ANALYZER AN EVACUATED CHAMBER, AND MEANS TO REGULATE THE PRESSURE IN SAID CHAMBER COMPRISING VACUUM PUMP MEANS FOR EVACUATING SAID CHAMBER TO A PREDETERMINED PRESSURE, AND MEANS SUPPLYING GAS TO MAINTAIN SAID PRESSURE COMPRISING A SOURCE OF SAID GAS AT GREATER THAN ATMOSPHERIC PRESSURE, A CONDUIT CONNECTING SAID SOURCE AND SAID CHAMBER, A CONSTANT PRESSURE REGULATING VALVE IN SAID CONDUIT RECEIVING GAS FROM SAID SOURCE AND PASSING IT UNDER REDUCED PRESSURE THROUGH SAID CONDUIT, AND A RESTRICTED ORIFICE CONTROLLING FLOW FROM SAID CONDUIT INTO SAID EVACUATED CHAMBER, SAID CHAMBER HAVING A CENTRAL DEPENDING EXHAUST DUCT AND AN INLET DUCT DISPOSED TO DISCHARGE AGAINST SAID EXHAUST DUCT, A SCREEN SEALED TO AND COMPLETELY SURROUNDING SAID EXHAUST DUCT AND FORMING SAID CHAMBER INTO TWO PORTIONS ISOLATED BY SAID SCREEN, A CATHODE ON THE EXHAUST DUCT SIDE OF SAID SCREEN, AND A FILM OF DEPOSITED METAL ON THE WALLS OF SAID CHAMBER ON THE INLET SIDE OF SAID SCREEN.

Claim 4

IN A GAS ANALYZER AN EVACUATED CHAMBER, AND MEANS TO REGULATE THE PRESSURE IN SAID CHAMBER COMPRISING VACUUM PUMP MEANS FOR EVACUATING SAID CHAMBER TO A PREDETERMINED PRESSURE, AND MEANS SUPPLYING GAS TO MAINTAIN SAID PRESSURE COMPRISING A SOURCE OF SAID GAS AT GREATER THAN ATMOSPHERIC PRESSURE, A CONDUIT CONNECTING SAID SOURCE AND SAID CHAMBER, A CONSTANT PRESSURE REGULATING VALVE IN SAID CONDUIT RECEIVING GAS FROM SAID SOURCE AND PASSING IT UNDER REDUCED PRESSURE THROUGH SAID CONDUIT, AND A RESTRICTED ORIFICE CONTROLLING FLOW FROM SAID CONDUIT INTO SAID EVACUATED CHAMBER, SAID CHAMBER HAVING A CENTRAL DEPENDING EXHAUST DUCT AND AN INLET DUCT DISPOSED TO DISCHARGE AGAINST SAID EXHAUST DUCT, A SCREEN SEALED TO AND COMPLETELY SURROUNDING SAID EXHAUST DUCT AND FORMING SAID CHAMBER INTO TWO PORTIONS ISOLATED BY SAID SCREEN, A CATHODE ON THE EXHAUST DUCT SIDE OF SAID SCREEN, AND A FILM OF DEPOSITED METAL ON THE WALLS OF SAID CHAMBER ON THE INLET SIDE OF SAID SCREEN.