Abstract

A target pattern of concentric rings varying from fine lines to broad bands has been placed in the open face of a desk lamp. This luminous target is useful in the study of the gloss characteristics of the more glossy surfaces. The lines and bands of various sizes in the target provide means for studying surfaces of a wide range of “distinctness-of-reflected-image” gloss. Records may be made of which lines and bands are visible by reflection from different surfaces. Such records serve as permanent gloss values for the different surfaces studied. The dark areas of the target immediately adjacent to the luminous areas provide ideal conditions for the identification of surface “bloom.” The best gloss differentiations are made when the lamp is used in a darkened room so that the luminous pattern is the only source of light illuminating the surfaces inspected. Photographic records of gloss and unusual gloss effects are discussed.

© 1936 Optical Society of America

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References

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  1. Scientific Section Circular No. 493 of the National Paint Varnish and Lacquer Association, Washington, D. C. (October1935). In this circular are described the gloss comparator and also the different appearance effects identified with glossiness. A bibliography on gloss-measuring methods is included.
  2. Hunter, “The Glossmeter,” Scientific Section Circular No. 456 of the National Paint Varnish and Lacquer Association, Washington, D. C. (April1934).
  3. McNicholas, “Absolute Methods in Reflectometry,” Bur. Standards J. Research 1, 29 (1928), Research Paper No. 3.
    [Crossref]

1928 (1)

McNicholas, “Absolute Methods in Reflectometry,” Bur. Standards J. Research 1, 29 (1928), Research Paper No. 3.
[Crossref]

Hunter,

Hunter, “The Glossmeter,” Scientific Section Circular No. 456 of the National Paint Varnish and Lacquer Association, Washington, D. C. (April1934).

McNicholas,

McNicholas, “Absolute Methods in Reflectometry,” Bur. Standards J. Research 1, 29 (1928), Research Paper No. 3.
[Crossref]

Bur. Standards J. Research (1)

McNicholas, “Absolute Methods in Reflectometry,” Bur. Standards J. Research 1, 29 (1928), Research Paper No. 3.
[Crossref]

Other (2)

Scientific Section Circular No. 493 of the National Paint Varnish and Lacquer Association, Washington, D. C. (October1935). In this circular are described the gloss comparator and also the different appearance effects identified with glossiness. A bibliography on gloss-measuring methods is included.

Hunter, “The Glossmeter,” Scientific Section Circular No. 456 of the National Paint Varnish and Lacquer Association, Washington, D. C. (April1934).

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Figures (4)

F. 1
F. 1

Target pattern mounted in desk lamp, two panels in position for comparison, and camera to photograph images of target pattern reflected in panel surfaces.

F. 2
F. 2

One quarter circle of the target pattern reproduced full scale, with letters to identify the different rings and lines.

F. 3
F. 3

Comparison of three pairs of panels using the gloss-inspection lamp. a, olive-green enamels; b, white, resinous paints; and c, rubbed furniture finishes. Distances of camera to surface and lamp to surface both about 30 cm; room dark.

F. 4
F. 4

Comparison of a pair of panels shown in Fig. 3 printed from same negative as in Fig. 3, but with low density to show effect of bloom on panel a–l.

Tables (1)

Tables Icon

Table I Tabulation of distinctness-of-image gloss ratings by six observers of the three pairs of surfaces compared in Fig. 3. Surfaces were observed at two distances and surface characteristics noted.