FIELD: testing of stresses by photoelasticity method. SUBSTANCE: device of axial motion of hollow shaft made for interaction with polarizer drive members and quarter-wave plates and with drive shaft connected by means of analyzer drive member, is made in form of lever two-sided fork with bearings at the ends, which entering from one side the annular recess of internal hollow shaft, and from the other side, the recess of radial-end face cam attached to shaft with control lever. Device for installation of light filter and compensating plate is made in form of lever with stop. Installed on one arm of stop is light filter and compensating plate, and the other arm is compressed by spring to end face of cam. EFFECT: higher efficiency. 2 dwg
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