OPTICAL PROTRACTOR Russian patent published in 1995 - IPC

FIELD: instrument engineering. SUBSTANCE: radiation from object under test is collected by objective of telescope at conjugated point of focal plane and created image of observed object. Image of scale is formed at the same plane of the objective by means of pancratic microscope. Image of indication line is built at the same place by means of image transmission lens system. All these images are observed through eye-piece of the telescope. EFFECT: improved precision. 2 cl, 6 dwg