Apparatus for collecting and quantitatively measuring particles

Claim 1

AN INSTRUMENT FOR ASCERTAINING THE QUANTITY OF PARTICLES OF MAGNETIC MATERIAL IN A FLUID STREAM WHICH COMPRISES A MAGNETICALLY PERMEABLE CORE MEMBER DEFINING A FIRST AND SECOND MAGNETIC FLUX CIRCUIT, A FIRST PORTION OF SAID CORE BEING COMMON TO BOTH SAID FIRST AND SAID SECOND FLUX CIRCUITS, SAID FIRST PORTION AND A SECOND PORTION OF SAID CORE INDEPENDENT OF SAID SECOND FLUX CIRCUIT DEFINING SAID FIRST FLUX CIRCUIT AND SAID FIRST PORTION AND A THIRD PORTION OF SAID CORE INDEPENDENT OF SAID FIRST FLUX CIRCUIT DEFINING SAID SECOND FLUX CIRCUIT, SAID CORE MEMBER BEING DISCONTINUOUS TO DEFINE, A GAP IN SAID SECOND PORTION OF SAID CORE, SAID CORE MEMBER BEING DISCONTINOUS TO DEFINE, A GAP IN SAID THIRD PORTION OF SAID CORE, A FIRST COIL ABOUT SAID FIRST PORTION OF SAID CORE FOR GENERATING AND ALTERNATING MAGNETIC FLUX IN BOTH SAID FIRST AND SECOND FLUX CIRCUITS WHEN ENERGIZED BY SAID ALTERNATING CURRENT, A SECOND COIL ABOUT SAID SECOND PORTION OF SAID CORE FOR GENERATING AN INDUCED ALTERNATING VOLTAGE UPON ENERGIZATION OF SAID FIRST COIL BY ALTERNATING CURRENT, A THIRD COIL ABOUT SAID THIRD PORTION OF SAID CORE FOR GENERATING AN INDUCED ALTERNATING VOLTAGE UPON ENERGIZATION OF SAID FIRST COIL BY AN ALTERNATING CURRENT AND FOR CONNECTION IN AN EXTERNAL CIRCUIT WITH SAID SECOND COIL TO DEVELOP A DIFFERENTIAL IN INDUCED VOLTAGES, A FOURTH COIL ABOUT SAID SECOND PORTION OF SAID CORE FOR GENERATING A UNIDIRECTIONAL MAGNETIC FLUX IN SAID FIRST FLUX CIRCUIT UPON ENERGIZATION BY DIRECT CURRENT, AND MEANS FOR PASSING A FLUID STREAM CONTAINING MAGNETIC PARTICLES CONSECUTIVELY THROUGH SAID FIRST GAP AND SAID SECOND GAP WHEREBY SAID PARTICLES ARE COLLECTED IN SAID FIRST GAP CHANGING THE RELUCTANCE THEREOF AND THEREBY CHANGING THE DIFFERENTIAL OF INDUCED VOLTAGES OF SAID SECOND AND THIRD COILS AS A FUNCTION OF THE QUANTITY OF MAGNETIC PARTICLES IN SAID FLUID STREAM.