Patent ID: 6067719
Filing Date: 2000-05-30
Classification: G01B

Abstract:
A ruler device for eliciting judgments about the ratio of factors comprising:a first base member;a second base member slidably mounted to said first base member so that said second base member moves longitudinally along said first base member;first indicia on said first base member indicating an optical weighing of factors;second indicia on said second base member indicating the ratio of the factors, said second indicia adjacent with the first indicia and alignable by relative movement of the first and second base members with respect to each other;the first and second indicia interrelated such that when the second indicia optically represents the ratio of the factors under observation, said second base member and the second indicia align with the first indicia, and a value of the ratio of the factors is determined therefrom;wherein the first indicia comprises a pair of diametrically opposite numerical scales on opposite ends of said first base member.