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1947-48 Theatre Catalog, 6th Edition, Page 270 (256)

1947-48 Theatre Catalog, 6th Edition
1947-48 Theatre Catalog
1947-48 Theatre Catalog, 6th Edition, Page 270
Page 270

1947-48 Theatre Catalog, 6th Edition, Page 270

PLEXIGLAS EDGE-LIGHTED MURALS in the Sheraton Lounge, Sheraton Hotel, New York, provide decoration as well as supplemental room illumination. Each panel, designed and executed by the Endicott Corporation, is in glowing colors. Lighting is supplied by a single fluorescent tube in each box.

ters is somewhat more than the length of the straight edge of the sheet. This method, therefore, has the advantage of introducing light on a longer surface than a single edge and a rather intense light is available. Since in this system light enters the sheet in all directions, it is necessary to paint all four edges of the sheet to keep light from escaping.

Uniform illumination of an edge-lighted sheet is often diiiicult to obtain, but designers can employ various devices to avoid trouble from this source. In many cases it is practicable to light the sheet on two or more edges to increase the amount of light available. In other instances, the design itself can be planned to compensate for the lighting characteristics by avoiding the placing of large masses of engraved or painted areas in any one spot. It is especially important to avoid such masses near the light source.

In a short edge-lighted piece uniform illumination can be obtained by making the engraving progressively deeper as the distance from the light source increases. In such a case the light that

EDGE-LIGHTED, ENGRAVED PIEXIGLAS can be used in a variety oi places. as indicated by these pictures from the Waliord Restaurant, Newark, New Jersey. Designed and executed by the Endicott Corporation, the clock and the triptych mural glow in light orange against an opaque background.

is traveling along essentially parallel lines in the small area may be a sizeable fraction of the whole illumination and the pro gre s siv e l y deeper cuts under these conditions reach successively lower t(layersti of the parallel light. Each cut, therefore, receives nearly the same amount of illumination. This device is not effective in large areas, because in such cases the near-parallel light,spreading through the bigger sheet, is employed in lighting the portions farther from the source.

Another device which aids in providing even illumination in short edgelighted pieces is tapering the piece so that it decreases in thickness as it gets farther from the source of light (Figure 16). The rays that are more nearly parallel to the axis of the wedge will travel farther before they strike the surface at an angle great enough to allow them to escape. In addition to its use in improving the illumination of a design, this device is also helpful for concentrating light rays at the end of a bar in such light-piping applications as are used in dental or medical instruments.

In some cases the decorative and func

tional applications of edge-lighting are most effectively combined, Light fixtures can combine edge-lighting with the direct light for beautiful effects. Advertisements in color and light can be made in this way and signs such as itstopll signs or thalkeDonit Walk,y signs, that are visible only When lighted, are practical attention-getters.


While edge-lighting and light-piping open a wide field of uses, there are certain limitations to their application. Obviously, dirt and scratches on the acrylic material disturb the surface the same as paint or engraving, and such defacement will be edge-lighted with the design. When edge-lighting is used where the plastic is greatly exposed to scratching or soiling it is sometimes desirable to cover the panels with a protective sheet of glass. Edge-lighting is also limited in its application on large outdoor signs because of the difficulty in securing adequate illumination over a large area. But these limitations of edge-lighting are negligible compared to the many useful applications to which it can be put.

1947-48 Theatre Catalog, 6th Edition, Page 270