Ratio ruler for comparative judgments

Details Ratio ruler for comparative judgments Ratio ruler for comparative judgments

1997-11-12

2000-05-30

Fulton, Christopher W.

Geometrical instruments

Apparel

Laying out

33 15B, 33485, 434322, G01B 304

Patent

active

060677198

ABSTRACT:
A ruler device for eliciting judgements about the ratio of factors includes a first base member having first indicia indicating the ratio of factors, and a second base member slidably mounted to the first base member. The second base member moves longitudinally along the first base member, and has second indicia indicating an optical weighing of the factors. The second indicia is adjacent with the first indicia and alignable with respect thereto by relative movement of the first and second base members with respect to each other. When the second indicia are aligned with the first indicia in accordance with a predetermined manner, a value of the ratio of the factors is determined therefrom.

REFERENCES:
patent: Re11450 (1894-10-01), Steck
patent: 346371 (1886-07-01), Humphrey
patent: 3144716 (1964-08-01), Cich
patent: 4750270 (1988-06-01), Kundikoff

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