USD27493S - Design for a lens for gratings - Google Patents
Design for a lens for gratings Download PDFInfo
- Publication number
- USD27493S USD27493S US D27493 S USD27493 S US D27493S
- Authority
- US
- United States
- Prior art keywords
- design
- lens
- gratings
- projections
- jacobs
- Prior art date
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- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000005755 formation reaction Methods 0.000 description 1
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Description
RD 25A DESIGN.
J. JACOBS. LENS FOR GRATINGS.
No. 27,493. Patented Aug. 3,1897.
@ZM/M:
UNITED STATES PATENT OFFICE.
JACOB JACOBS, Ol BROOKLYN, NIUV YORK.
DESIGN FOR A LENS FOR GRATINGS.
SPECIFICATION forming part of Design No. 27,493, dated August 3, 1897. Application filed May 8. 1897. Serial No. 635,753- Term of patent 14 years.
To all [vital/t 1'! may (.YHUIPIIL.
Beitknown that I, JACOB JACOBS, of Brooklyn, in the county of Kings, and in the State of New York, have invented a certain new and original Design for a Lens for Illuminating-Gratings; and I do hereby declare that thefollowingisafull,clear,and exactdeseription thereof, reference being had to the acdesign for lenses for illuminating-gratings; i
and to this end said invention consists in the design for a lens, substantially as hereinafter set forth.
As shown in the drawings, the leading or material feature of my design consists in the Fig. 2 isa section of the i formation on the lens A of numerous projections B and B, each of which has four sides, two of which converge and have the form of quadrangles and the other two have the form of triangles. The projections 13 and 13 range in parallel lines, the triangular sides of the projections of adjaecntlines beinginclined, so that they diverge, the appearance presented being that of V-shaped spaces between the lines of projections.
Having thus described my invention, what I claim is The design for a lens, substantially as set forth.
In testimony that I claim the foregoingl have hereunto set my hand this 7th day of May, 1897.
JACOB JACOBS.
Witnesses:
J AS. E. IIUTCHINSON, CHAS. J. WILLIAMsoN.
Family
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