USD27999S - Design for a prism-plate - Google Patents
Design for a prism-plate Download PDFInfo
- Publication number
- USD27999S USD27999S US D27999 S USD27999 S US D27999S
- Authority
- US
- United States
- Prior art keywords
- prism
- design
- plate
- prisms
- hollow square
- Prior art date
Links
- 238000000926 separation method Methods 0.000 description 1
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Description
EX n9o75 OR D 27,999
DESIGN.
P. L. WRIGHT. PRISM PLATE. No. 27,999. Patented Dec. 7, 1897 I WW WWWW WWW W WW WWW WWWW W was nonms I'EYCRS c0. moraumo mswmnmn n c UNITED STATES PATENT OFFICE.
FRANK L. WRIGHT, OF CHICAGO, ILLINOIS, ASSIGNOR TO THE LUXFER PRISM PATENTS COMPANY, OF SAME PLACE.
DESIGN FOR A PRISM-PLATE.
SPEQIFIGATION forming part of Design No. 27,999, dated December 7, 1897.
Application filed October 21, 1897. Serial No. 655,977. T rm of patent 14 years.
To aZZ whom it may concern.-
Be it known that I, FRANK L. WRIGHT, a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented a certain new and original Design for Prism-Plates, of which the following is a description.
My invention relates to designs for prislnplates.
Figure 1 is a plan view of aprism-plate embodying my design. Fig. 2 is a section therethrough.
A is the body of a prism-plate; B B, a series of lines of separation on one side thereof, whereby the surface on such side is divided into a series of surface areas 0 O of substantially uniform size.
I) D are prisms of a certain angle, as indicated, and forming the field of the prismplate.
E E are a series of prisms of a different angle and arranged so as to form a sort of hollow square intermediate between the center and the outer edge of the prism-surface. \Vhen considered from the prism side, the hollow square is formed of prisms of a given angle and the field both within and without the hollow square is formed of a series of prisms of a different angle. \Vhen viewed from the other side, the field and the hollow square will differ in appearance, so as to be distinguishable one from the other.
The essential features of my invention are found in a prism-plate comprising a substantially flat extended body with prisms on one side, the prisms having different angles, those of one angle forming a hollow square and those of another angle forming a field Within and without the square.
I claim- A design for a prism-plate, substantially as shown and described.
FRANK L. WRIGHT.
W'itnesses:
FRANCIS W. PARKER, C. A. LoNeEELLoW.
Family
ID=
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