Patent ID: 7738082
Filing Date: 2010-06-15
Classification: F41G,G01C

Abstract:
1. A system for measuring a size of a feature of a distant object, comprising: a rangefinder operable to determine a range to the distant object and to generate an output signal indicative of the range; an aiming mark to facilitate aiming the rangefinder at the distant object; an optical sighting device including a visual display displayed in a field of view of the optical sighting device, the visual display comprising: a variable scale having a gauge for measuring the feature of the distant object and an indicia associated with the gauge; and the variable scale responsive to the output signal of the rangefinder to alter the gauge or the indicia, or both, so that the indicia represents a linear dimension at the determined range that is subtended by the gauge, whereby the size of the feature is estimable by a visual comparison between the gauge and the feature, with reference to the indicia.