Gauge for measuring carpet soiling

Details Gauge for measuring carpet soiling Gauge for measuring carpet soiling

1980-05-09

1981-11-03

McGraw, Vincent P.

Optics: measuring and testing

Inspection of flaws or impurities

Having predetermined light transmission regions

356238, 356243, G01N 2188

Patent

active

042982820

ABSTRACT:
A soil gauge for measuring the relative amount of soiling of a carpet. The soil gauge is made from a transparent material having several viewing areas. The viewing areas are covered with a multiplicity of opaque marks in varying degrees of concentration. An unsoiled sample of carpet is placed next to the carpet to be tested and the soil gauge is placed between the unsoiled sample and the user's line of vision. When the appearance of the unsoiled carpet, as viewed through the gauge, is as close in appearance as possible to the soiled carpet, the position along the gauge through which this similar appearance is achieved is noted, and this position is a measurement of the relative soiling of the carpet.

REFERENCES:
patent: 1802052 (1931-04-01), Guernsey et al.

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