GEAR TO TAKE READINGS BY LIMB OF GONIOMETER Russian patent published in 1995 - IPC

FIELD: optical geodetic instrumentation. SUBSTANCE: gear includes reading microscope and two projection reversing systems optically matching reading microscope and three sections of limb spaced apart by 120 deg from each other. First projection system has two rectangular prisms, two objectives and diaphragm installed in plane of aligned focal planes providing telecentric path of rays. Second projection system is produced with additional reversing of image in at least one plane, it has two rectangular prisms and two objectives. Limb divisions are fabricated in the form of bisectors with lines differing in length 2 fold or more. EFFECT: simplified design, improved authenticity of readings. 4 cl, 3 dwg