Instrumentation for the automatic, simultaneous ultramicro determination of the c-h-n contents of organic compounds

Claim 1

ULTRAMICRO ANALYSIS APPARATUS FOR MEASUREING THE C-H-N CONTENTS OF AN ORGANIC SAMPLE BY THE COMBUSTION THEREOF AND THE SUBSEQUENT MEASUREMENT OF THE GASEOUS PRODUCTS OF SUCH COMBUSTION, SAID APPARATUS COMPRISING: A COMBUSTION TUBE, A REDUCTION TUBE, AND A WATER ABSORPTION TUBE, SAID TUBES BEING COUPLED IN SERIES FLUID-FLOW RELATION IN THE ORDER MENTIONED; A CATHAROMETER HAVING A PLURALITY OF CELLS, EACH HAVING A RESPECTIVE RESISTANCE WIRE THEREIN, AND COUPLED TO SAID REDUCTION TUBE TO RECEIVE A FLOW OF GASES THEREFROM, ONE OF SAID CELLS BEING COUPLED TO SAID WATER ABSORPTON TUBE TO RECEIVE A FLOW OF GASES THEREFROM; A VOLTAGE INTEGRATOR IN A BRIDGE CIRCUIT WHICH INCLUDES SAID CATHAROMETER WIRES AND A VOLTAGE SOURCE, WHICH BRIDGE CIRCUIT PROVIDES SIGNALS TO SAID INTEGRATOR RESPONSIVE TO THE CONCENTRATIONS OF C-H-N IN THE FLOW OF GAS THROUGH SAID CATHAROMETER;