Instrument for determining from a distance the winning point in the French version of bowls by perspective and incorporated midline

摘要

1. Sighting means for marking the midline of two competing bowls in the French version of bowls, using the perspective, and for determining the position of the target bowl in relation to the midline in order to mark the bowl susceptible to win, comprising a rigid, plane and transparent support (1) on which segments (2A, 2B, 2C) of parallel straight lines and a joint midline (3) of these segments are marked, characterized by an adjusting means (5, 6) ensuring that the optical axis of the eye is perpendicular to the joint midline (3) and the horizontal plane of the segments.