Surgery – Truss – Perineal
Patent
1976-09-07
1979-01-23
Michell, Robert W.
Surgery
Truss
Perineal
350130, 351 33, A61H 500
Patent
active
041355024
ABSTRACT:
Stereoscopic patterns are disclosed which have a multiplicity of representations on a backing, with the representations spaced apart in substantially horizontal rows. The spacing between pairs of adjacent representations is varied to produce a stereoscopic effect. The resulting pattern is continuous, eliminating the ghost images associated with prior art stereoscopic pictures. The representations may be identical, may be varied shapes formed of identical elements, or may be a sequential series of perspective views of the same subject. The patterns may be viewed stereoscopically in either of two manners: by diverging or straightening one's line of vision while holding the pattern relatively close, or by converging or crossing one's line of vision while holding the pattern relatively far away. When viewed in the first manner, the patterns simulate distance vision while being held close-up, providing relaxing viewing to the eyes of one engaged in close work.
REFERENCES:
patent: 759229 (1904-05-01), Bechtold et al.
patent: 1955275 (1934-04-01), Draper
patent: 2035511 (1936-03-01), Silverstein
patent: 2114060 (1938-04-01), Oakley
patent: 2391248 (1945-12-01), Koch
patent: 2603124 (1952-07-01), Richards
patent: 3143642 (1964-08-01), Compare
patent: 3226867 (1966-01-01), Newton
Bauch and Lomb Stereoscopic Test Chart 1926.
Michell Robert W.
Thaler Michael H.
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