Polariscope for taking and printing photographs of stress trajectories and shear flow

Claim 1

A POLARISCOPE FOR OBTAINING STRESS TRAJECTORIES AND SHEAR FLOWS, COMPRISING A FIRST TABLE HAVING A SOURCE OF LIGHT THEREON, A ROTATABLE POLARIZER IN FRONT OF SAID LIGHT SOURCE, SAID LIGHT SOURCE AND POLARIZER BEING ON A FIRST OPTICAL AXIS, A CONDENSER, A ROTATABLE ANALYZER, AND A ROTATABLE CAMERA ON SAID FIRST TABLE ALONG A SECOND OPTICAL AXIS, SAID CAMERA HAVING INTERNAL REFLECTING MEANS THEREIN FOR INTERNALLY REFLECTING AN IMAGE TO AN AXIS PARALLEL TO SAID SECOND OPTICAL AXIS, MEANS ON SAID TABLE CONNECTED TO SAID POLARIZER, ANALYZER AND CAMERA FOR SIMULTANEOUSLY ROTATING THEM, A SECOND TABLE POSITIONED IN FRONT OF SAID SOURCE OF LIGHT AND HAVING A DOUBLE MIRROR THEREON FOR RECEIVING INCIDENT LIGHT FROM ALONG SAID FIRST AXIS FROM SAID SOURCE AND REDIRECTING THE LIGHT ALONG SAID SECOND OPTICAL AXIS OF SAID CONDENSER, ANALYZER AND CAMERA, A LOADING DEVICE FOR A SPECIMEN ON SAID SECOND TABLE BETWEEN SAID DOUBLE MIRROR AND SAID CONDENSER, AND A THIRD TABLE POSITIONED BEHINED SAID FIRST TABLE AND HAVING A PHOTOGRAPHIC PRINTING LIGHT THEREON ON SAID OPTICAL AXIS.