Optical device for orienting monocrystals along the axis of the crystal

Claim 1

AN OPTICAL DEVICE COMPRISING AN AUTOCOLLIMATOR FOR ORIENTING SPECIMENS OF MONOCRYSTALS ALONG THEIR CRYSTAL AXIS, COMPRISING AN OPTICAL SYSTEM HAVING AN OPTICAL AXIS INCLUDING A SOURCE OF LIGHT, A COLLIMATRO DIAPHRAGM HAVING A RELATIVELY RESTRICTED SMALL ROUND APERTURE THROUGH WHICH RAYS OF LIGHT ARE DIRECTED FROM SAID SOURCE A COLLIMATOR OBJECTIVE SPACED FROM SAID DIAPHARGM, A DIVISION PRISM BETWEEN SAID OBJECTIVE AND APERTURE, AN OCULAR OFFSET FROM SAID PRISM FOR RECEIVING REFLECTED LIGHT IMAGES FROM SAID PRISM, AND A PLANE PARALLEL PARTIALLY TRANSMITTING MIRROR PLATE WHICH IS SUBSTANTIALLY NORMALLY ALIGNED TO THE OPTICAL AXIS AND ARRANGED IN FRONT OF SAID COLLIMATOR OBJECTIVE, SAID MIRROR PLATE REFLECTING A LIGHT IMAGE OF SAID APERTURE TO SAID DIVISION PRIMS AND THEN TO SAID OCULAR IN THE FORM OF A SMALL DOT MARK CENTERED IN SAID OCULAR WHILE ANOTHER LIGHT IMAGE OF SAID CRYSTAL AXIS IS REFLECTED FROM SAID SPECIMEN THROUGH SAID MIRROR PLATE TO SAID DIVISION PRISM AND THEN TO SAID OCULAR WITH THE SMALL DOT MARK LIGHT IMAGE OF SAID APERTURE INDICATING THE OPTICAL AXIS OF SAID AUTOCOLLIMATOR, SAID DIVISION PRISM BEING ORIENTED TO REFLECT BOTH OF SAID LIGHT IMAGES TOWARD SAID OCULAR WHEREBY MANIPULATION AND ORIENTATION OF SAID SPECIMENT WILL CAUSE THE REFLECTED IMAGE OF SAID CRYSTAL AXIS TO BE BROUGH INTO REGISTRY AND CENTERED WITH THE SMALL CENTERED DOT MARK IMAGE OF SAID APERTURE.