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2. Loupe - Wikipedia

   en.wikipedia.org/wiki/Loupe

   Loupe-mounted lights used to be fed by fiber optic cables that connected to either a wall-mounted or table-top light source. Newer models feature a more convenient LED lamp within the loupe-mounted light and an electric cord coming from either the conventional wall-mounted or table-top light source or a belt clip rechargeable battery pack.

3. Fresnel lens - Wikipedia

   en.wikipedia.org/wiki/Fresnel_lens

   First-order rotating catadioptric Fresnel lens, dated 1870, displayed at the Musée national de la Marine, Paris.In this case the dioptric prisms (inside the bronze rings) and catadioptric prisms (outside) are arranged to concentrate the light from the central lamp into four revolving beams, seen by sailors as four flashes per revolution.

4. 50 Inventions From The Past That Were Amazingly Innovative - AOL

   www.aol.com/98-historical-inventions-were-ahead...

   The television goggles used small cathode-ray tubes for the display and included a separate screen for each eye, much like modern VR headsets. The large antenna made this device look alien-like ...

5. Magnifying glass - Wikipedia

   en.wikipedia.org/wiki/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. 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. A plastic Fresnel lens sold as a TV-screen magnifier

6. Tritium radioluminescence - Wikipedia

   en.wikipedia.org/wiki/Tritium_radioluminescence

   Tritium is the only radiation source used in radioluminescent light sources today due to its low radiological toxicity and commercial availability. [3] Various preparations of the phosphor compound can be used to produce different colors of light. For example, doping zinc sulfide phosphor with different metals can change the emission wavelength ...

7. J.E. Caldwell & Co. - Wikipedia

   en.wikipedia.org/wiki/J.E._Caldwell_&_Co.

   Urn with Egyptian figures, part of a six-piece tea and coffee service, J.E. Caldwell & Company, Philadelphia, c. 1875. J.E. Caldwell & Co. was a major jewellery retailer and one-time silversmith in Philadelphia, Pennsylvania.