Photometer automatic sample changer

Claim 1

IN A PHOTOMETER HAVING A SOURCE OF RADIATION AND A PHOTOSENSITIVE RECEIVER, A SAMPLE CHANGER MOUNTED ON THE PHOTOMETER, SAID SAMPLE CHANGER COMPRISING A BASE, A HOUSING DEPENDING FROM SAID BASE AND HAVING RESPECTIVE EXPOSURE APERTURES FACING SAID SOURCE AND RECEIVER, A PLUNGER MEMBER IN SAID HOUSING, MEANS BIASING SAID PLUNGER MEMBER UPWARDLY TO A POSITION COVERING SAID APERTURES, A TURRET ROTATABLY MOUNTED ON SAID BASE AND HAVING A PLURALITY OF SAMPLE TUBE-RECEIVING OPENINGS SELECTIVELY REGISTRABLE WITH SAID PLUNGER MEMBER, AN UPSTANDING SUPPORT ON SAID BASE, AN ARM SLIDABLY AND ROTATABLY MOUNTED ON SAID SUPPORT, A DEPENDING PUSHER AND ROTATABLY SAID ARM REGISTRABLE WITH SAID PLUNGER MEMBER IN A FIRST POSITION OF SAID ARM AND BEING ENGAGEABLE WITH A SAMPLE TUBE REGISTERING WITH SAID PLUNGER MEMBER TO MOVE THE SAMPLE TUBE DOWNWARDLY ADJACENT SAID EXPLOSURE APERTURES RESPONSIVE TO DEPRESSION OF SAID ARM, AND MEANS TO ROTATE SAID TURRET STEPWISE RESPONSIVE TO ROTATION OF SAID ARM BETWEEN SAID FIRST POSITION THEREOF AND A SECOND POSITION THEREOF.