US 734135 A
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Description (OCR text may contain errors)
PATENT-ED JULY 21, 1903.
v A. B. PORTER.
DEGORA'TED SURFACE. AIPLICIATIOIIIl FILED HAY 22, 1903.
IIIIIIl 3o surface.
No. 734,7135; f
UNITED STATES ratentea July 2i, ieo.
ALEERT B. PORTER, OE EvANsTON, ILLINOIS.
DECO RATED su RFACE'.
'SPECIFICATION forming part of Letters PatentvNo. 734,135, dated 3111?/ 21, 1903- Application iiled May 22, 1903. Serial No. 158,339. (No modela) 5 nois, have invented certain new and useful Improvements in Decorated Surfaces, of
Which the following is a specification. This 4invention relates more particularly to the decorating of glass, metal, and otherware io with diffraction grating-surfacesfor the purpose of producing colored-light effects. It is already Well understood that a surface provided with a single grating or one consisting of a single set of parallel lines will produce a brilliant display of spectrum colors, and in my companion application, Serial No. 112,780, filed June 23, 1902, I have pointed'out that if the grating consists of a plurality of sets of parallel lines crossing each other angularly,
zo so as to diffract the light-rays in' different directions, it Will produce a highly-colored rainbow appearance, no matter fromwhat direction the surface is viewed. I have also discovered that a somewhat-different but still z 5 highly-decorative effect may be produced by providing the surface with rulings which differ in direction in adjacent portions, so that the light is diffracted dierently to the eye from these diiferent portions of the decorated In the simplest application Of my improvement in this respect single parallel rulings differing in direction will be placed in spots over the surface to be decorated.
More highly developed, the invention contemplates rulings differing in direction in adjacent portions of the decorated surface ac-l cording to a predetermined arrangement by which the light dilfracted by the rulings will produce on the eye the effect of a distinct 4o pattern or figure, and in this case the rulings, may consist of either single or crossed sets of-v lines.
The object of the invention isto provide improved decorative eects for glass, metal,
and other Ware along the lines above indigo shows how the surface may be decorated by Single parallelrulings arranged at different angles in diiferent portions of the decorated appear differently to the eye.
surface. Fig. 2 shows a pattern effect pro'- duced in a similar manner by varying the directions of the rulings according to some predetermined design.' Fig. 3 shows a pattern decoration produced by crossed sets of lines.
As shown in Fig. I, single diractiOn-rulings a, cousis'tingof closely-adjacent parallel lines, usually several thousand to the inch, are applied in spots all over the decorated surface A, which may be that of glass, metal, pottery, or other material and may be either a dat or curved surface'. The rulings of the several spots dier from each other in direction, and as a consequence the lightfrom each source will be differentlydiffracted from the different portions of the surface and' each portion will Thus some of the spots Will show a more brilliant display of spectrum colors than others,and some of the spots are liable not to show any color at all, for the reason that the single diractionrulings will only diifract the light from each source in a single direction, which may not be in a direction to meet the eye. As a Whole, however, the surface Will appear brilliantly decorated in colors which will vary in appearance and effect with every movement either of the light, the surface, or the point of View.
In Fig. 2 a distinct pattern effect is shown as produced by applying the dierent rulings after a predetermined arrangement, which in this instance consists of arranging the rulings in-rows and making the directions of the ruliings the same in every other spot of each row.
In Fig. San effect similar to that of Fig. 2 is produ`cedfby crossed instead Of single parallel diffraction-rulings. Where crossedr rulings are provided, the number of different directions of ruling employed in the several spots of the surface need not be so great to produce an equally varied effect as where single rulings alone are employed.
It will be understood that the term rulings as used herein is intended to be generic to diffraction grating-surfaces consisting of closely adjacent parallel lines, straight or curved, without regard to the manner in which said lines may be applied to the surface, whether mechanically,photographically, or otherwise. Most conveniently such rulings Will be applied photographically, and in case a patterneffect such as that shown in Figs. 2 and 3 is desired it may be produced by using a previously-ruled printing-plate and rotating the same through the requisite angle bet-Ween the printings of the adjacent spots, which printing will be done or the light for it admitted through an opaque screen having an openinplr of the form of the desired spots. As shown in Figs. 2 and 3, this opening is assumed to have been a square; but it will be obvious that other shapes of opening may be employed and that the pattern effect given the decorated surface may be varied indefinitely by changes inthe screen-opening or differing manipulations of the printingplate.
I claim as my invention-'- 1. As a new article of manufacture, glass, pottery, and metal ware, having;r its surface decorated in separate portions with sets of closely-adjacent parallel lines forming dif- ALBERT B. PORTER.
HENRY W. CARTER, K. A. COSTELLO.