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It includes everything they need to unearth the 15 real gemstones—an excavation tool, magnifying glass, and excavation brush—plus it comes with a full-color guide to help them identify what ...
Grandma's Reading Glass is a 1900 British silent trick film, directed by George Albert Smith, featuring a young boy who borrows a huge magnifying glass to focus on various objects. The film was shot to demonstrate the new technique of close-up .
The invention of reading stones is often credited to Abbas ibn Firnas in the 9th century, [1] although the regular use of reading stones did not begin until around 1000 AD. [ 2 ] [ 3 ] Early reading stones were made from rock crystal (quartz), beryl and glass, which could be shaped and polished into lenses used for magnification.
A magnifying glass is a convex lens that is used to produce a magnified image of an object. The lens is usually mounted in a frame with a handle. A magnifying glass can be used to focus light, such as to concentrate the Sun's radiation to create a hot spot at the focus for fire starting.
After turning 40, founder Rick Hopper started using readers and began habitually losing, scratching and dropping his glasses. [1] In 2010, Hopper made prototypes using paperclips and magnets, solving the problem he had with trying to keep his glasses safe and secure. [1] It did not take long for consumer interest to grow.
A dome magnifier is a dome-shaped magnifying device made of glass or acrylic plastic, used to enlarge words on a page or computer screen. They are plano-convex lenses : the flat (planar) surface is placed on the object to be magnified, and the convex (dome) surface provides the enlargement.
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