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  2. Testor Corporation - Wikipedia

    en.wikipedia.org/wiki/Testor_Corporation

    In January 1986 Testors released a model kit of a hypothetical F-19 Stealth Fighter, designed using open source intelligence [6] [7] before the real F-117 Nighthawk was introduced. Although it was very different from the actual plane, [ 8 ] video games and many other toys and models were inspired by this fictional design.

  3. Underground press - Wikipedia

    en.wikipedia.org/wiki/Underground_press

    La Libre Belgique, an underground newspaper produced in German-occupied Belgium during World War I. In Western Europe, a century after the invention of the printing press, a widespread underground press emerged in the mid-16th century with the clandestine circulation of Calvinist books and broadsides, many of them printed in Geneva, [1] which were secretly smuggled into other nations where the ...

  4. Vortex shedding - Wikipedia

    en.wikipedia.org/wiki/Vortex_shedding

    The Strouhal number depends on the Reynolds number, [5] but a value of 0.22 is commonly used. [6] As the unit is dimensionless, any set of units can be used for the variables. Over four orders of magnitude in Reynolds number, from 10 2 to 10 5 , the Strouhal number varies only between 0.18 and 0.22.

  5. Strength tester machine - Wikipedia

    en.wikipedia.org/wiki/Strength_tester_machine

    A strength tester machine (right) besides a love tester machine at a Framingham, Massachusetts rest stop. A strength tester machine is a type of amusement personality tester machine, which upon receiving credit rates the subject's strength, according to how strongly the person presses levers, squeezes a grip or punches a punching bag.

  6. Vortex ring gun - Wikipedia

    en.wikipedia.org/wiki/Vortex_ring_gun

    Knock-down test of a 109 mph (175 km/h; 49 m/s) vortex ring gun. The vortex ring gun is an experimental non-lethal weapon for crowd control that uses high-energy vortex rings of gas to knock down people or spray them with marking ink or other chemicals. The concept was explored by the US Army starting in 1998, and by some commercial firms.

  7. A clandestine Army operative concealed his mental health ...

    www.aol.com/news/clandestine-army-operative...

    Froede was indeed a clandestine soldier who worked highly classified operations for the United States Army in the Middle East, Africa and Southeast Asia. But the rest was a paranoid delusion.

  8. Vortex mixer - Wikipedia

    en.wikipedia.org/wiki/Vortex_mixer

    A Scientific Industries Inc. Vortex-Genie 2 vortex mixer in operation A vortex mixer , or vortexer , is a simple device used commonly in laboratories to mix small vials of liquid. It consists of an electric motor with the drive shaft oriented vertically and attached to a cupped rubber piece mounted slightly off-center.

  9. Vortex flowmeter - Wikipedia

    en.wikipedia.org/wiki/Vortex_flowmeter

    A vortex flowmeter has the following components: A flow sensor operable to sense pressure variations due to vortex-shedding of a fluid in a passage and to convert the pressure variations to a flow sensor signal, in the form of an electrical signal; and a signal processor operable to receive the flow sensor signal and to generate an output signal corresponding to the pressure variations due to ...