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2. Opera glasses - Wikipedia

   en.wikipedia.org/wiki/Opera_glasses

   Mother of pearl opera glasses and leather case. Opera glasses with handle, ca.1910. Opera glasses, also known as theater binoculars or Galilean binoculars, are compact, low-power optical magnification devices, usually used at performance events, whose name is derived from traditional use of binoculars at opera performances.

3. Stanhope lens - Wikipedia

   en.wikipedia.org/wiki/Stanhope_lens

   Stanhope lens with case, early 1800s. A Stanhope lens is a simple, one-piece microscope invented by Charles, the third Earl of Stanhope. It is a cylinder of glass with each end curved outwards, one being more convex than the other. The focal length of the apparatus is at or within the device so that objects to be studied are placed close to or ...

4. Magnifying glass - Wikipedia

   en.wikipedia.org/wiki/Magnifying_glass

   A pen seen through a magnifying glass Jim Hutton as detective Ellery Queen, posing with a magnifying glass. 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. Beyond its primary function of magnification, this simple yet ingenious tool serves a ...

5. Magnification - Wikipedia

   en.wikipedia.org/wiki/Magnification

   The postage stamp appears larger with the use of a magnifying glass. Stepwise magnification by 6% per frame into a 39-megapixel image. In the final frame, at about 170x, an image of a bystander is seen reflected in the man's cornea. Magnification is the process of enlarging the apparent size, not physical size, of

6. Nimrud lens - Wikipedia

   en.wikipedia.org/wiki/Nimrud_lens

   [1] [2] [3] This would make it equivalent to a 3× magnifying glass. [5] The surface of the lens has twelve cavities that were opened during grinding, which would have contained naphtha or some other fluid trapped in the raw crystal. The lens is said to be able to focus sunlight, although the focus is far from perfect.

7. Trainer shares three expert-approved tips to stop your dog ...

   www.aol.com/trainer-shares-three-expert-approved...

   Atlas Pet Company Lifetime Leash. Available in 5ft or 8ft lengths, this leash is made from climbing rope and made to last a lifetime. It’s not cheap, but you’re getting a durable and ...