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  2. Curtiss Aerocar - Wikipedia

    en.wikipedia.org/wiki/Curtiss_Aerocar

    Although the Curtiss Camp Car patent referred to a second forthcoming patent application for a Curtiss-designed fifth-wheel coupling, no such patent was submitted. Images of the Camp Car held in the archives of the Glenn H. Curtiss Museum indicate that the fifth-wheel hitch used was the commercially available Martin Rocking Fifth Wheel.

  3. Fifth-wheel coupling - Wikipedia

    en.wikipedia.org/wiki/Fifth-wheel_coupling

    After all, the purpose of the fifth wheel is to link the tractor and the trailer; indeed, trailers existed before Charles H. Martin introduced the Martin Rocking Fifth Wheel in 1915. At the time, the fifth wheel literally was a wheel that moved with the trailer—unlike today’s technology that secures a kingpin.

  4. Chromatic circle - Wikipedia

    en.wikipedia.org/wiki/Chromatic_circle

    The circle of fifths in 12-tone equal temperament drawn within the chromatic circle as a star dodecagon [1] For any positive integer N , one can represent all of the equal-tempered pitch classes of N -tone equal temperament by the cyclic group of order N , or equivalently, the residue classes modulo twelve, Z/NZ.

  5. Pythagorean tuning - Wikipedia

    en.wikipedia.org/wiki/Pythagorean_tuning

    12-tone Pythagorean temperament is based on a sequence of perfect fifths, each tuned in the ratio 3:2, the next simplest ratio after 2:1 (the octave). Starting from D for example (D-based tuning), six other notes are produced by moving six times a ratio 3:2 up, and the remaining ones by moving the same ratio down:

  6. Seeing the number 1212 everywhere? Here's what it might mean

    www.aol.com/seeing-number-1212-everywhere-heres...

    12 basic rules for long, lasting relationships. 75 Monday motivation quotes to start your week off strong. As you do this, continue to “invest in your own development and create well-defined ...

  7. Meantone temperament - Wikipedia

    en.wikipedia.org/wiki/Meantone_temperament

    Twelve-tone equal temperament (12 TET) is obtained by making all semitones the same size, with each equal to one-twelfth of an octave; i.e. with ratios 12 √ 2 : 1. Relative to Pythagorean tuning , it narrows the perfect fifths by about 2 cents or ⁠ 1 / 12 ⁠ th of a Pythagorean comma to give a frequency ratio of 2 7 / 12 : 1 {\displaystyle ...

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