GONIOMETER FOR OPTICAL OBSERVATION DEVICE Russian patent published in 1995 - IPC

FIELD: instrumentation engineering. SUBSTANCE: goniometer is composed of hollow cylindrical dish filled with optically clear fluid where float with clear card with angle-measuring scale, hair line-marks on one of flat glasses is positioned, outer ring on tube having magnetic coupling with outer ring of dish. Dish rotates in tube on two identical rings with equal inner diameters of rolling surfaces placed in symmetry. Outer diameter of dish has collar entering annular groove between two specified rings. Outer diameter of dish over rolling surface is less than inner diameter of rings over their rolling surfaces. Outer ring has one magnetic insert of sector shape with envelopment angle 40-120 deg magnetized along axis of tube. Rings inside tube and outer ring of dish are made from magnetically soft iron. Width of groove between rings in tube is considerably larger than difference of diameters of rings specified above. EFFECT: expanded application field. 2 dwg