Oil tester

Claim 1

A PORTABLE OIL TESTER COMPRISING: AN ADJUSTABLE BRIDGE CIRCUIT HAVING A FIRST PAIR OF TERMINALS AND A SECOND PAIR OF TERMINALS AND INCLUDING A PHOTOCONDUCTIVE CELL ELEMENT AS ONE LEG THEREOF; VOLTAGE SUPPLY MEANS COUPLED ACROSS SAID FIRST PAIR OF TERMINALS; A CURRENT SENSITIVE DEVICE INCLUDING AN INDICATOR COUPLED ACROSS SAID SECOND PAIR OF TERMINALS; HOUSING MEANS FOR ENCLOSING THE ABOVE-RECITED APPARATUS INCLUDING A FRAME MEMBER, AN APERTURE IN ONE WALL THEREOF WITH SAID CURRENT SENSITIVE DEVICE MOUNTED THEREAT TO PROVIDE FOR VIEWING SAID INDICATOR; A SUPPORTING CYLINDER SECURED TO ONE SIDE PORTION OF SAID FRAME MEMBER; MEANS FOR MOUNTING SAID PHOTOCONDUCTIVE CELL ELEMENT THEREIN; AN UPPER SHADOW CYLINDER THREADABLY ENGAGED WITH SAID SUPPORTING CYLINDER AND ADAPTED TO BE MOVED IN AN AXIAL DIRECTION BY ROTATION THEREOF; A LAMP HOLDING CYLINDER SECURED TO SAID FRAME MEMBER IN AN AXIAL ALIGNMENT WITH SAID SUPPORTING CYLINDER; A LIGHT SOURCE LOCATED WITHIN SAID LAMP HOLDING CYLINDER; ELECTRICAL MEANS FOR ENERGIZING SAID LIGHT SOURCE; A LOWER SHADOW CYLINDER THREADABLY ENGAGED WITH SAID LAMP HOLDING CYLINDER AND BEING AXIALLY MOVABLE BY ROTATION THEREOF; A SPECIMEN STAND BEING PIVOTALLY ATTACHED TO SAID FRAME MEMBER AND BEING LOCATED BETWEEN SAID UPPER AND LOWER SHADOW CYLINDERS TO PIVOT INTO AXIAL ALIGNMENT WITH SAID UPPER AND LOWER SHADOW CYLINDERS INTO A TEST POSITION AND BEING PIVOTALLY MOVABLE OUTWARDLY IN A SUBSTANTIALLY HORIZONTAL POSITION FOR RECEIVING A TEST SPECIMEN, THE SPECIMEN WHEN IN SAID TEST POSITION BEING IN AXIAL ALIGNMENT WITH SAID PHOTOCONDUCTIVE CELL ELEMENT AND SAID LIGHT SOURCE AND INTERSECTING THE LIGHT TRANSMITTED FROM SAID LIGHT SOURCE TO SAID PHOTOCONDUCTIVE CELL ELEMENT SO AS TO MAKE THE BRIDGE CIRCUIT RESPONSIVE TO THE LIGHT TRANSMISSION FACTOR OF THE TEST SPECIMEN THEREBY PROVIDING A QUALITATIVE MEASUREMENT OF SAID SPECIMEN.