Stanhope lens

Stanhope lens

[′stan‚hōp ‚lenz]
(optics)
A thick biconvex lens with front and back surfaces having radii of curvature of two-thirds and one-third the lens thickness; used as a magnifier by placing the object to be viewed in contact with the front surface.
References in periodicals archive ?
A Stanhope lens was a simple, one-lens microscope invented by the Earl of Stanhope.
He modified the Stanhope lens by making one end flat.
The actual Stanhope lens was invented by Charles, 3rd Earl Stanhope, (1753-1816) but he died many years before his invention was used in the manufacture of novelty souvenirs.
The Stanhope lens was combined by Rene Prudent Patrice Dagron (1819-1900) of France with a micro-photograph to form a single miniature magnifying unit, which he patented in 1859.
He combined the Stanhope lens with a microphotograph to forma single miniature magnifying unit, which he patented in 1859.