Saturday, December 28, 2013

Mathematics of Music by Sir James Jeans

The following is the outline of a paper by Sir James Jeans found in The World of Mathematics, Volume 4, page 2278. This paper follows the same outline as his text, Science and Music, written in 1937. The text also includes chapters on Vibrations of Air, Harmony and Discord, and The Concert Room.

Mathematics of Music by Sir James Jeans

  1. Tuning-Forks and Pure Tones
    1. Pure Tone
    2. Period, Frequency and Pitch
    3. General Theory of Vibrations
    4. Simultaneous Vibrations
    5. Sound Curves of a Tuning Fork
    6. Energy
    7. Simultaneous Sounds
    8. Superposing Vibrations of the Same Period
  2. The Vibrations of Strings and Harmonics
    1. Experiments with a Monochord
    2. Mersenne’s Laws
    3. Harmonic Analysis
    4. String Plucked at its Middle Point
    5. Analysis of a Sound-Curve
    6. Natural Harmonics and Resonance
  3. Hearing
    1. The Threshold of Hearing
    2. The Scale of Sound Intensity
    3. The Threshold of Pain


http://www.amazon.com/Science-Music-Dover-Books/dp/0486619648 

Sunday, December 8, 2013

Could the Babylonians have done this?

FACT: The Babylonians estimated the value of pi to be 3 1/8.
FACT: Based on the Plimpton Tablet, we know that the Babylonians were aware of "Pythagorian Triples".

UNCERTAINTY (for me personally): The Babylonians method of establishing the value of pi is based on the perimeter of a hexagon inscribed within a circle. I am still searching for specifics as to how this determines the value of the perimeter of the hexagon to be 25/8.

QUESTION: Could this approximation of squaring the circle have been used by the Babylonians?