Device for optical examination of gem materials with polarized light

Claim 1

A FOLDABLE DEVICE FOR USE IN LTHE EXAMINATION OF TRANSPARENT OR TRANSLUCENT GEM MATERIALS WITH POLARIZED LIGHT, SAID DEVIDE BEING ADAPTED TO BE HELD UP TO AN EYE OF THE OBSERVER SO THAT THE GEM MATERIAL MAY BE MANIPULATED IN THE DVICE AND INSPECTED IN POLARIZSED LIGHT, THE COMBINATION COMPRISING A TRAY, A PAIR OF LIGHT POLARIZING ELEMENTS, A THIRD LIGHT POLARIZING ELEMENT, AN EYEPIECE AND A MASK FOR ONE OF SAID PAIR OF LIGHT POLARIZING ELEMENTS PIVOTALLY SUPPORTING SAID PAIR OF LIGHT POLARIZING ELEMENTS TOGETHER ADJACENT TO EACH OTHER IN ONE END PORTION OF SAID TRAY, MEANS PIVOTALLY SUPPORTING SAID MASK ADJACENT TO SAID ONE OF SID PAIR OF POLARIZING ELEMENTS, MANS PIVOTALLY SUPPORTING SAID EYEPIECE AND SAID THIRD LIGHT POLARIZING ELEMENT IN THE OTHER END PORTION OF SAID TRAY, SAID EYEPIEC, SAID LIGHT POLARIZING ELEMENTS AND SAID MASK BEING FOLDABLE INTO OR OUT OF SAID TRAY, THE OTHER OF SAID PAIR OF LIGHT POLARIZING ELEMENTS AND SAID THIRD LIGHT POLARIZING ELEMENT BEING SUPPORTED WITH THE LIGHT POLARIZING PLANES THEREOF CROSSED WHEN THESE ELEMENTS ARE FOLDED OUT OF SAID TRAY SO THAT GEM MATERIALS SUPPORTED AAND ROTATED THEREBETWEEN MAY BE EXAMINED TO DETERMINE WHETHER THEY ARE SINGLY OR DOUBLY REFRACTIVE WHEN SAID DEVICE IS POINTED IN THE DIRDCTION OF A LIGHT SOURCE AND HELD WITH SAID EYEPIECE UP TO AN EYE OF THE OBSERVER, SAID MASK BEING ADAPTED TO RENDER SAID ONE OF SAID PAIR OF LIGHT POLARIZING ELEMENTS INEFFECTIVE WHEN SAID MASK IS FOLDED OUT OF SAID TRAY AND THE DEVICE IS USED AS A POLARIXCOPE, SAID PAIR OF LIGHT POLARIZING ELEMENTS HAVING THE LIGHT POLARIZING PLANES THEREOF AT RIGHT ANGLES TO EACH OTHER SO THAT THE DVICE IS ARRANGED TO FUNCTION AS A DISHROSCOPE WHEN THE THESE ELEMENTS ARE FOLDED OUT AND SAID MASK AND SAID THIRD LIGHT POLARIZING ELEMENT ARE FOLDED INTO SAID TRAY.