Geometrical instruments – Miscellaneous – Light direction
Patent
1977-06-27
1981-04-07
Martin, Jr., William D.
Geometrical instruments
Miscellaneous
Light direction
33 1BB, 33488, 350114, 434 90, 434 95, D06Q 100, B43L 1300
Patent
active
042597846
ABSTRACT:
The four sides of a rectangular piece of screening are secured into an open frame to form a grid. Opposite lengthwise sides of the frame are grooved on the edges to make a track along which a separate piece can slide. This piece consists of a long, rectangular, magnifier lens, of a length equal to the width of the grid screen, bonded at each end into a framework the total length of which extends over the two sides of the grid frame hooking into the two side grooves of the grid frame. Height of the lens framework is dependent upon distance necessary for maximum magnification of lens. The grid frame is placed over a picture or design to be copied and, as the lens is slid along the grid frame vertically, a graph of the design is magnified for reproduction square by square into any material compartmentalized to receive the graphic presentation. The invention is particulary adapted for needlepoint rendering.
REFERENCES:
patent: 241801 (1981-05-01), Hagan
patent: 1387439 (1921-08-01), Cross
patent: 1622229 (1927-03-01), Ormiston
patent: 2307358 (1943-01-01), Cloud
patent: 2746346 (1956-05-01), Gaire
patent: 3063162 (1962-11-01), Quinn
patent: 3217819 (1965-11-01), Allen
patent: 4001941 (1977-01-01), Cruz
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