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2. 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 ...

3. Sight glass - Wikipedia

   en.wikipedia.org/wiki/Sight_glass

   Simple sight glasses may be just a plastic or glass tube connected to the bottom of the tank at one end and the top of the tank at the other. The level of liquid in the sight glass will be the same as the level of liquid in the tank. Today, however, sophisticated float switches have replaced sight glasses in many such applications.

4. Float (liquid level) - Wikipedia

   en.wikipedia.org/wiki/Float_(liquid_level)

   Liquid level floats, also known as float balls, are spherical, cylindrical, oblong or similarly shaped objects, made from either rigid or flexible material, that are buoyant in water and other liquids. They are non-electrical hardware frequently used as visual sight-indicators for surface demarcation and level measurement. They may also be ...

5. C79 optical sight - Wikipedia

   en.wikipedia.org/wiki/C79_optical_sight

   A C79 Optical Sight. The C79 optical sight (SpecterOS3.4x) is a telescopic sight manufactured by Elcan. A variant, the M145 Machine Gun Optic is in use by the US military. It is 3.4×28, meaning 3.4x magnification, and a 28mm diameter objective lens. A tritium illuminated reticle provides for normal and low-light conditions sighting. [1]

6. Level (optical instrument) - Wikipedia

   en.wikipedia.org/wiki/Level_(optical_instrument)

   The Y level or wye level is the oldest and bulkiest of the older style optical instruments. A low-powered telescope is placed in a pair of clamp mounts, and the instrument then leveled using a spirit level, which is mounted parallel to the main telescope. The term dumpy level (also builder's level) endures despite the evolution in design. They ...

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8. Free Online Games: Play board games, card games, casino ... - AOL

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   Discover the best free online games at AOL.com - Play board, card, casino, puzzle and many more online games while chatting with others in real-time.

9. Play Just Words Online for Free - AOL.com

   www.aol.com/games/play/masque-publishing/just-words

   If you love Scrabble, you'll love the wonderful word game fun of Just Words. Play Just Words free online!