Sine quadrant or Rub'ul mujayyab

thingiverse

The sine quadrant or Rub'ul mujayyab enables users to perform swift and precise trigonometric calculations along with various related functions. Originating in the Middle East and Persia prior to the 10th century, it soon spread into Europe. **Key Components:** * A pale wood is preferred for this project; I used craft plywood. * A cord * A bead that fits snugly on the cord but can be moved as needed * A weight for the end of the cord; I used a brass fishing weight **Files for Printing and Laser Cutting:** For printing on paper, use ZodiacSineQuadrant_Print.eps, ZodiacSineQuadrant_Print.pdf, or ZodiacSineQuadrant_Print.png. For laser cutting, use ZodiacSineQuadrant_Laser.dxf or ZodiacSineQuadrant_Laser.svg. The laser files are colored as follows: * RED: Cut through the material * BLUE, GREEN, YELLOW, PURPLE, and BLUE-GREEN: Cut/etch surface; adjust speed/power for optimal results * BLACK: Raster scan **My Construction Process:** To minimize smoke residue, I covered the top of the wood with painters tape before cutting. After cutting, I removed the tape using a paint scraper and cleaned up with an orbital sander. Drill a small hole at the origin for the cord. **Links to Additional Information:** Wikipedia: https://en.wikipedia.org/wiki/Sine_quadrant My blog: http://www.astrolabeproject.com/ Class handout: http://astrolabeproject.com/downloads/quadrants/SineQuadrantHandoutVersion1.pdf Simulator: http://www.astrolabeproject.com/sim/sine/quad.html