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Recent content by perion666

  1. perion666

    Invention of the cross product

    BTW - the book cited in that article, A History of Vector Analysis; The Evolution of the Idea of a Vectorial System, Michael J. Crowe, 1967, republished in 1985, is EXCELLENT!!! See here for details. dh
  2. perion666

    Watching stars on earth's poles

    The original conjecture would be pretty much valid if the earth's axis of rotation was perpendicular to both the the galactic plane and it's own orbital plane about the sun (which they aren't). In that case, the Milky Way bands would remain pretty much overhead at the equator and barely visible...
  3. perion666

    Magnetic encoder principle

    principle magnetic encoder It may be a "magnetostrictive linear position sensor". If so, see: https://www.sensorland.com/HowPage024.html perion666
  4. perion666

    Project ideas in Industrial and Automobile field

    Re: Project Ideas Hi all, Everyone has their favorites when it comes to microcontrollers but I have found Microchip's PIC (Peripheral Interface Controller) line to suit my fancy. Microchip will give you various controllers as free samples on a regular basis. Their MPLAB IDE is free and their...
  5. perion666

    Looking for a book about integral calculus

    Re: Integral calculus The attached zip is four PDFs. They start at pre-calc topics in the first PDF and go through differential equations in the fourth PDF. I think you find they're pretty close to what you're looking for. If you happen to have Mathematica I can give you some excellent Calc...

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