FIELD: measurement technology. SUBSTANCE: invention can find use in measurement of direction and value of vector of velocity of flow, for instance, on aircraft. Gear includes first source of marks placed in center of ring detector and second and third sources which are positioned on lines perpendicular one another and are embraced by ring detector. Fourth source of marks located in symmetry with second or third source of marks with reference to first source can be used to increase sensitivity of gear without enlargement of dimensions of structure. EFFECT: diminished sizes and improved adaptability to manufacture. 1 cl, 1 dwg
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