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These Reading Knives have precision sharpened mirrored
blades. With a
long enough blade to reach the spines of most books, Reading
Knife's
smooth surface slides easily over their pages. An alternative to
glasses for the hard-of-seer, Reading Knife enlargens the size of
printed text by
reflection of the letter on its angled surface.
Dual
Reading Knives are sold in each ornate set to reverse then
rereverse
each line of text as they guide your eyes down the page.
Reading Knives also have knuckleduster page holder
attachments. The right page Reading Knife is twice as long as
the left page reading knife, so the book can be held open by
insertion of the left book cover into the right page knife
knuckleduster and right, left.
illustration
http://imgur.com/XYpzejD
[rcarty, Dec 06 2013]
[link]
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I'm normally pretty good at visualising, but in this case, a sketch would REALLY help. Particularly in explaining the optical path. |
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Highly polished sharp things, mmmmm … [+] |
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Using a concave mirror, the mirror itself can invert the image. An example is looking behind yourself using the bowl of a spoon. In that case, it makes the image smaller as well. However I think that with the mirror held close to the line of text being read, it would be possible to get the curve right so it both inverts and magnifies, implementing this beautiful device in an even simpler and elegant single blade. |
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But I don't quite picture how the knuckleduster part works. |
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The right page holder, the longer one on the left, is
longer IN function as a page holder because it wraps
around the cover. The left knife is shorter in function as a
primary reflector because it is held in the hand, and the
knuckleduster does not function longitudinaly. |
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