The term “parabolic reflector” refers to any type of glass that has been formed into the shape of a paraboloid of revolution. This is the shape of glass often found in antique microscopes and telescopes, as well as the shape of magnifying mirrors used in today’s cosmetics industry.
The material (usually glass), is cut into a shape that curves inwards and refracts light in such a manner that when looked through, in the case of clear glass, or at, in the case of mirrored glass, the object appears larger to the human eye. This was developed by John Hadley in 1721 and replaced the use of spherical glass for magnifying purposes.
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Parabolic devices were most popular during the early 19th century, especially in the use of cameras, telescopes, and microscopes. A glass lens in any true piece from this time frame will more than likely contain at least one parabolic reflector, so be sure to check for one as a matter of determining authenticity.
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